>> reporter: what did she do? >> i didn't realize she was involved as deep as she was. scholar. professor. mother: >> what is going to happen to my daughter? i am innocent! >> she certainly knew. >> manipulative, in your eyes? >> yes. >> reporter: everything is at stake. >> i could face life in prison. i'm willing to do anything that needs to be done. >> reporter: i'm lester holt and this is dateline. >> now, i have the strength! >> reporter: tonight andrea canning with "the secret." >> reporter: she was the embodiment of the american dream. an immigrant who'd escaped a childhood of poverty and abuse, attended elite schools, and rose to the top of her field. against all odds, norma patricia esparza grew up to become a well-respected psychology professor and a champion for children's health care around the world. a success story. a life 40 years in the making. so how on earth did it come to this? >> whatever the charges are that they're asking me to plead guilty for is essentially something that i cannot accept because it would essentially be a lie. >> reporter: the professor's case would draw international attention. >> a university of california -- >> a young mother and professor who is now in custody. >> behind bars in connection with the murder of her alleged -- >> rapist with a meat cleaver. >> the 39-year old woman says she is the victim. >> reporter: and it started a heated debate. >> this is not america. this is not justice. this is abuse of power. >> reporter: did this well-educated mother orchestrate a horrific murder then sabotage the investigation? >> you don't get a pass to become a vigilante and kidnap people and kill them. >> reporter: or was she the victim at the center of it all? >> do you ask yourself, "how did i get here?" >> oh, absolutely. absolutely. i rewind so many events in my life. i rewind so many things in my mind. >> reporter: to try to make sense of this mystery you do have to rewind. all the way back to 1974, the year patricia was born in a small farming town in southern mexico. >> it was just a very rural, rustic place. it's a town with unpaved streets, no sewage, no running water. >> reporter: the family moved to southern california for a better life, but patricia's life here wasn't easy. she says her dad physically abused her mother. >> my father had lots of difficulties. he was an alcoholic and he was quite violent with her. >> reporter: and patricia says she, too, was victimized by her dad claiming he had sexually abused her, beginning when she was just five years old. >> as a five year old i -- i couldn't go to anybody for help. he -- who could i go to? i couldn't go to him. he was the one abusing me. i couldn't go to my mother when she couldn't stop him from beating her. so i really had nowhere to turn. >> reporter: apparently patricia didn't tell anyone at the time. both her mother and sister learned about the abuse later. patricia's brother said their father eventually admitted to him that the abuse had happened. but the brother also said his father would not respond to our questions about it. >> the way that i dealt with all that chaos was to throw myself into my books, into education. >> so the bad things that were happening in your life were really driving you to essentially be a better person? >> absolutely. >> to better yourself. >> absolutely. yeah. >> reporter: and all her studying paid off. she excelled, earning a scholarship to attend high school at phillips exeter academy, a prestigious boarding school in new hampshire. >> it just must have been a culture shock to go from the life that you had to this very privileged surrounding. >> oh, absolutely. absolutely. >> did you feel like you were living the american dream? >> oh, absolutely. i've always been so grateful to the u.s. >> reporter: she probably could have had her pick of any ivy league school, but chose to attend pomona, a top notch college near her family's california home. but on one weekend in her sophomore year, her dreams of a happy college life were dashed. it was march 1995. that's when she made a decision that would haunt her for the rest of her life. >> i was a very serious student. i wasn't a drinker, i wasn't a partier. >> reporter: although she didn't go out often, one saturday night patricia decided to go to the "el cortez" night club. there someone caught her eye. >> i met this person. and we exchanged numbers. >> what was it about him that -- >> i -- >> --attracted you? >> there was really nothing attractive or unattractive, it was just somebody -- somebody who seemed to be nice. i didn't think that i would be seeing this person again. >> reporter: but he called the very next morning. and invited patricia to breakfast, along with her sister and friend. after they ate, he offered patricia a ride back to campus. >> when we get to pomona, he says, you know, "before i go, would you mind if i get a glass of water?" so, so we go to my dorm. >> reporter: and it was then, she says, the casual date turned terrifying. >> when we're inside, he -- he tells me that -- that he wants to have sex. and i tell him, "no, i'm not he starts to get aggressive and starts to -- to try to kiss me. and i -- i push him away. we're struggling. and then ultimately he takes off my pants and he forces himself on me. when he's finished, i -- i just turn away from him and, half naked, and i curled up into a ball, and i just start sobbing. when he gets to the door, he tells me, "you have a lot of problems," and he walks away. >> reporter: patricia says she was raped, and like many victims she felt somehow it was her fault. >> oh, god. i felt so dirty and so ashamed, and i was just blaming myself. i thought, "my goodness, why? why did you -- why did you do this? why did you bring him here? why did you trust him?" >> reporter: patricia didn't call the police. but the next day, she went to her college health center where she says she saw a nurse. but says the nurse didn't take any action to report her rape allegation. >> i told her that i had been raped. and -- and i -- i remember her reaction because it made me feel just as ashamed. she didn't want to deal with it. she -- she walked away. >> reporter: patricia herself had walked away from terrible experiences before, but moving on from this proved nearly impossible. especially when just weeks later police found a body. a body? when we come back: a strange and sinister puzzle. >> i've been to a lotta scenes in my career, but this one was a little more gruesome. >> reporter: a mystery victim. a crime of passion. and on the back of a phone bill, a clue. >> there was a handwritten note that said "patty." tiful fluidity. restoring strength and flexibility ♪ ♪ so it moves and responds the way you do. ♪ ♪ new improved nexxus with concentrated elastin protein and precious ingredients. for hair that lives to move. introducing light & fit protein shakes the new way to help make temptations shrink away. with 12 grams of protein, 5 grams of fiber and 0% fat. new light & fit protein shakes. taste the power of satisfaction. 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"hey have you seen my brother? no." >> reporter: carlos drove around that night searching, but never found gonzalo. at 8:30 the next morning, easter sunday, 1995, investigator larry montgomery got a call at home. he immediately knew something bad had happened. >> it was my sergeant. and he told me that there was a body found and i was to respond. >> reporter: montgomery, at the time, was an experienced detective with the irvine, california police department. he was used to dealing with murders, but this one stood out. >> i've been to a lotta scenes in my career. but this one was a little more gruesome just because of the sheer amount of injury to the body. he was definitely hacked to death. >> reporter: the man's body had been found near a stretch of the 405 freeway. he had clearly suffered a brutal death. his body was sliced dozens of times with some type of heavy-bladed knife, like a meat cleaver or machete. his right hand was nearly severed. and oddly, there was some kind of blue towel-like material wound around the body. >> the blue towel was wrapped all around it from the torso and legs all the way up the neck area. it was wrapped around five times around the neck then several times around the eyes. >> reporter: one thing was clear to police, this murder was personal. >> after looking at the victim's injuries, i would say that it was really consistent with somebody who had some sort of heat of passion. because the injuries are just consistent with somebody very angry. >> reporter: detectives had so many questions. who was this man and why had this happened to him? >> one of the problems we had is we have no identification on the victim. >> reporter: another day passed, it was now monday. gonzalo's family heard that a body was found in the area. praying it wasn't their brother, they called police. >> when this man called he identified himself as -- he had a brother that was missing from santa ana area, and he was possibly kidnapped. and so he thought that it was very possibly his brother that was the victim. >> reporter: police were able to connect the dots rather quickly. the body they'd found was that of gonzalo ramirez. when his family went to identify his remains they couldn't believe how he looked. >> when we pick up my brother we couldn't recognize his face. >> it's very sad. you know i -- i don't want anybody see one of his family like we -- we saw it. >> reporter: gonzalo left behind two little daughters, just one and two years-old. >> he was a very good person. he was responsible person. we have no idea why. >> reporter: police were also trying to find out "why." their only witness was gonzalo's friend, the last person to see him alive. >> he was pretty detailed and -- and able to give the -- the responding officers at that time a lot of good physical descriptions of both the vehicle and the suspects. >> reporter: but the friend said he had no idea who the men in the white van were, or why a fender bender turned into a kidnapping and murder. >> where do you go from there when you don't even know who these men are? >> well, generally, you would start with the individual who's been kidnapped, looking into their background, seein' what's goin' on in their life, whether they have financial issues, maybe a love relationship that's ended. >> reporter: detectives interviewed gonzalo's friends, work associates and family members and got nothing. >> i don't think they were able to provide anything that really could point the detectives at that time in the right direction. >> reporter: but, eventually investigators stumbled across something in gonzalo's home. something very curious scribbled on his phone bill. >> there was a handwritten note that said "patty." and there was two numbers. >> was this patty someone they needed to talk to right away? >> it was. >> reporter: coming up -- and talk they did. >> i was just weeping and crying. it was really hard. >> reporter: "patty" is about to open up to the police. >> that's kind of a twist that threw a whole new element into the investigation. >> reporter: when dateline continues. chase freedom. the card is for the essentials. the cash back is for the fun. chase. so you can. our pizza hut big flavor dipper pizza is almost two-feet of pizza. whoa. you're gonna need a bigger car. get the new big flavor dipper pizza with four flavorful sauces and a free pepsi 2-liter with online orders. just $12.99. only at pizza hut. incredible! i've been claritin clear for ten days. when your allergy symptoms start, doctors recommend taking one claritin every day of your allergy season for continuous relief. with powerful 24-hour, non-drowsy claritin live claritin clear. every day. 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[sfx: yeti noise] ♪ we are farmers bum - pa - dum bum - bum - bum - bum ♪ there are a lot of channels on your tv but only so many you want to watch what if you could pay for the types of channels you want and not the ones you don't now, fios brings you a totally new way to customize your tv, at a price that's totally affordable. starting at $74.99 per month. get custom tv, including internet and phone. price guaranteed for two years. plus, get a $300 visa prepaid card with your 2 year agreement. go to getfios.com today. cable just gives you channels. fios gives you choice. call the verizon center for customers with disabilities at 800.974.6006 tty/v >> reporter: santa ana police were trying to solve the mystery of who had kidnapped, tortured and murdered gonzalo ramirez. the leads were thin until they stumbled across gonzalo's phone bill where he'd written the name "patty" along with two phone numbers. they were eager to find her. mike murray, an orange county deputy district attorney, didn't work this investigation back in 1995, but later joined the case. >> they called this patty? >> they did. >> and where did it lead them? >> they contacted her. and she agreed to come down to the police department and discuss gonzalo ramirez. >> reporter: the mysterious "patty," it turned out, was then-college student patricia esparza. >> i'm detective meza, this is corporal buckels. we work at the santa ana police department. >> uh-huh. >> she told the police that gonzalo ramirez was a young man that she had met at a club in santa ana several weeks prior. that they had danced together. she liked him. he seemed to like her. they exchanged phone numbers. >> reporter: that's how her name and numbers came to be scribbled on gonzalo's phone bill. but patricia didn't seem too concerned about why she was being questioned about gonzalo. >> at what point does she say, "what is this about? why are you asking me about this man?" >> she never does. >> she never asked? >> i don't ever recall her asking that question to the police during that interview. >> reporter: in the interview, patricia reluctantly told her story about what happened in the dorm room with gonzalo. >> while in your dorm, he took sexual advances of you, to the point of even possibly bein' a -- raped by him, was this correct? >> yes. he turned around and uh, kissed me and like i just stopped him right away, and i got up at that instant when he kissed me and um, i was walking towards another chair and then he got up also and -- and that's when it happened. >> she told the police that he had sexually assaulted her. >> that's kind of a twist, i mean, that threw a whole new element into the investigation. what did they make of it? >> well, initially they just wanted to hear what she had to say. >> reporter: she said the rape happened about 2 1/2 months earlier, but this was the first time she was reporting it to police. all the while, she says her world was falling apart. >> i was just weeping and crying. it was really hard, really hard to put myself together. i wasn't doing my assignments as i should have. my -- my grades were -- were dropping. and so i -- i wasn't able to deal with the rape as -- as well as i had wished i had. >> reporter: she also told police that after the alleged rape, she confided in an ex-boyfriend named gianni van. they'd dated for about seven months, but were no longer together. still, one day when gianni stopped by her dorm room, she broke down and told him what happened. >> that must have been hard to finally open up? >> yeah. yeah. i didn't feel that i -- that i wanted to. but i -- i guess i did want somebody to be there and understand. i wanted somebody to just listen to me and just make me feel that it wasn't -- that i wasn't so dirty and so ashamed. >> did he help you? did he make you feel better? >> at first, but then -- then he became angry, and i didn't understand why. i mean, yes, you know, of course you would be -- you would be angry, of course, if somebody did it to your sister, or to your friend. but we weren't together anymore. >> reporter: she told detectives about gianni and they listened, very carefully. >> did you have a boyfriend at that time? >> uh-huh. >> okay. what's his name? >> gianni van. >> what is it? >> gianni uh, well, he wasn't my boyfriend at that time actually. we had broken up. >> he was upset about it? >> um, yeah. of course. >> she did tell gianni that she had been raped by a man named gonzalo. but she said she wouldn't tell gianni what his full name was or anything about how to locate him. that she just wanted gianni to comfort her. didn't want him to try and find this guy and retaliate in any way. >> was he expressing that he did want to retaliate? >> she said that he was angry. she didn't say he wanted to retaliate. just that he was angry and he wanted to know more details than she wanted to disclose. >> reporter: an angry ex-boyfriend. could he have been angry enough to track down gonzalo on his own? >> did this give the detectives something to cling onto, that he was so angry about the -- the -- the rape claim? >> absolutely. i mean, you now have a motive for somebody wanting to do what they had done to mr. ramirez. detectives wanted to talk with gianni van, and they would soon find a key piece of evidence that they believed could tie him to this murder. >> so, the detectives must be thinking, "we -- we've got our guy?" >> they did. >> reporter: coming up -- >> you tell me right now, you tell me why you're not the guy. intense moments in the interrogation room. was it a meat cleaver? >> reporter: just what kind of evidence did they have against the man named gianni van? >> it was a huge clue. mira giving me new perspective. doctors have been prescribing humira for ten years. humira works for many adults. it targets and helps to block a specific source of inflammation that contributes to ra symptoms. humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal infections and cancers including lymphoma have happened, as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. before treatment get tested for tb. tell your doctor if you've been to areas where certain fungal infections are common, hepatitis b, are prone to infections, or have flu-like symptoms or sores. don't start humira if you have an infection. talk to your doctor and visit humira.com this is humira at work ♪ ♪ ♪ relay for life. help the american cancer society finish the fight. donate now at relay.org >> reporter: after speaking with patricia esparza about the murder of gonzalo ramirez, police quickly developed a theory of the case. patricia told them she had met gonzalo at a dance club. the next day he allegedly raped her, and that after hearing about that rape, her ex-boyfriend gianni van became enraged. investigators now believed this could be a case of an old boyfriend seeking revenge and they wanted to find gianni. >> they go to talk to him? >> they did interview mr. van. >> and where did that go? >> he denied any involvement with the death of gonzalo ramirez. >> reporter: in fact gianni told police he couldn't have had any role in the murder because patricia knew few details about gonzalo, including how to find him. >> i asked her, "do you know where this guy lives?" and she goes "no." "do you know who this guy is?" she goes, "no, i just met him at the club, and i don't know. he seems like a nice guy. and that's all i -- i just -- and he offered a ride home and that's it." >> reporter: prosecutor mike murray says when gianni came in for questioning investigators weren't buying his story. >> they questioned his story, particularly when they learned that he had a white van registered to him. >> white van was there rear-ending gonzalo? >> exactly. >> which is a big clue in this case. >> it was a huge clue. >> reporter: remember, the only eyewitness said several men in a white van beat and kidnapped gonzalo after a minor fender-bender. >> where was the van? >> when the police asked gianni if he was familiar with a white van, or if he owned one, gianni denied owning one. when they confronted him with the fact that there was a white astro van that was registered in his name, gianni said, "well, i don't own the van. it's registered under my name, but it actually belongs to a guy i know who owns a transmission shop." >> reporter: police got a search warrant for the "accurate transmission" shop. sure enough, the white van registered to gianni was there. but that's not all they found. >> the people who processed the transmission shop saw one single drop of blood in an office. >> reporter: and investigators found something else. remember those old-style towel dispensers in gas station bathrooms? the shop had that exact type of dispenser. >> the towel dispenser had blue cloth towels in the dispenser. and the towels that were wrapped around or the cloth that was wrapped around gonzalo ramirez was blue cloth. >> reporter: yet later, when that blood drop found in the shop was tested, the result was less than conclusive. >> did the blood match gonzalo? >> when they ran the dna profile they couldn't exclude mr. ramirez, but in no way was it strong enough to say that it was his. >> reporter: that was a problem for the investigation. so police brought gianni, the ex-boyfriend, back in a second time for questioning. >> this is lozano badge number 586, i'm gonna be conducting an interview of gianni van. >> reporter: but this time police had more information: they'd learned that gianni was good friends with the transmission shop owner. >> the relationship between you and the girlfriend, and then gonzalo, and then accurate transmission, and the van, all that comes into play quite obviously there's a chain there, it's unbroken chain. the common denominator, the common denominator you understand what i'm saying, right? you're an intelligent guy you're educated, is gianni van. >> okay. >> so all arrows were pointing at gianni? >> exactly. if ms. esparza has no connection to accurate transmission, then you're -- you're the link. >> reporter: the detectives pressed gianni, asking about the weapon they thought was used to kill gonzalo. >> was it a meat clever? >> i don't even know what you're talking about. >> was it a meat clever? >> this whole entire thing i don't know what you're talking about sir. >> uh-huh. you know what i would be talking about. >> reporter: gianni told police he could never kill another human being. >> you tell me why you're not the guy. you tell me, right now. you tell me why you're not the guy and why you shouldn't be going to jail for murder? >> because i am not a angry type of person. i've always been a loving person. i'm not quick to like have a temper and i don't, i would never think of such a thing that's absurd. >> everything's there, we got the motive, but see gianni i'm right at this point at this juncture of the interview is coming to a close now if you don't come out and give me more. gianni, you're gonna be going to jail for murder. >> okay. i don't know about anything. i swear to god i don't anything about what you're talking about. >> reporter: despite his denials, in march of 1996, nearly a year after the body was found, detectives arrested gianni van for the murder of gonzalo ramirez. but what investigators didn't know was that patricia had more secrets that would have a big impact on their case. coming up -- >> i feared for my life. >> patricia and gianni van, their relationship was far from over. new flonase. 6 is greater than 1. this changes everything. olive garden's all new duos are here. but not for long starting at $11.99. our most craveable classics like chicken parmigiana, paired with new tastes to explore, all served with unlimited salad and breadsticks. four all new duos, starting at $11.99. at olive garden. you wouldn't do half of your daily routine. so why treat your mouth any differently. brushing alone does less than half the job leaving behind millions of germs. complete the job with listerine®. kill up to 99 percent of germs. and prevent plaque, early gum disease and bad breath. complete the job with listerine®. power to your mouth™. also try listerine® floss. its advanced technology removes more plaque. >> reporter: police thought they had a solid case against gianni van for the murder of gonzalo ramirez. investigators were largely basing their case on the words of patricia esparza. she said gonzalo raped her, she confided in gianni, and he got very angry. giving him a motive for murder. but then prosecutors found out something surprising. something that changed everything. >> ms. esparza and gianni van had gotten married in las vegas after the murder. >> reporter: patricia, who told authorities gianni was her ex-boyfriend, had secretly married him one month after the murder. investigator dean fulcher. >> based upon the spousal privilege in the state of california, in no way was patricia gonna be forced to testify against gianni, who was still denying any involvement. >> reporter: without her testimony, said prosecutor mike murray, it would be very hard to prosecute gianni. >> this is a major game changer? >> absolutely. because ms. esparaza had so much information and was so meshed in the case, that the prosecution would be hampered to the point they wouldn't be able to prove the case beyond a reasonable doubt. so rather than put the case in front of a jury and take the chance that without all that critical background information that the jury wouldn't have a full picture, the decision was made to dismiss the case against gianni van. >> reporter: so gianni walked. and investigators were, to say the least, unhappy with patricia esparza. >> i, as well as detectives prior to me, knew that they got married for the simple fact they needed to keep patricia from testifying against gianni. >> reporter: why would patricia do that? she told us that in no way was she trying to protect gianni or the other men in the white van from that night. she said she had no choice, gianni forced her into the marriage. >> so how do you get into this situation? it sounds almost -- >> yeah. >> like, how does that happen? >> yeah. you know, i was -- again, i was 20. i was not very sophisticated, in terms of being street wise. >> but why say yes? why say, "yes, i'll marry you?" >> because i feared for my life. when i was told i had to marry him, that's when i learned that gonzalo ramirez had been killed. and i thought to myself, oh my goodness. if they are able to do that to him, what are they going to do to me if i don't follow what they say? >> reporter: patricia says besides being naïve. she was also extremely vulnerable. she described herself as haunted. a victim of an alleged rape in college and sexual abuse as a child. she questioned her own judgment and wondered how she could have ever dated gianni in the first place? after all, he was accused of a horrendous murder. victim. >> i didn't know that people were capable of that. of course you read things in the newspaper. you see things on tv. but you never think that it's going to cross your path. you never think that you are actually going to befriend a person that's capable of doing that. >> why not just go to the police and tell them everything? >> i wish they had told me, "we will protect you. we will protect you if you come forward." i wish they had told me that. i -- i didn't know. i didn't know that they were capable of protecting me. >> reporter: and so she says, she agreed to marry a man she believed was a murderer. >> were you in love when you married him? >> no. absolutely not. i was trapped. i just felt like -- i felt like it was another punishment for me. we never lived together. nobody knew about the marriage. i mean, how could you possibly be in love with somebody who is so horrific? >> reporter: patricia says she soon dropped all contact with gianni. but that didn't change her status as his wife. >> so, a marriage was potentially keeping a murderer free? >> correct. >> reporter: even though police thought they'd solved the murder, it went into the cold case file. as for patricia, she says she just wanted to put the whole, unbelievable tragedy behind her and get her life back. >> i thought to myself, you're not going to allow them to take away what's so valuable, and that's the ability to trust. how in the world am i going to continue on? >> reporter: but she did. she studied abroad in africa, then graduated from pomona. the first person in her family to get a college degree. she went on to work as a political activist. all the while, santa ana detective dean fulcher was keeping track of her and gianni van. >> patricia's life really changed over the years? >> yes. >> reporter: three, four, five years passed. the terrible events in california seemed further and further away. and in 2000 came another dramatic turn in patricia's life, when she met a distinguished scholar. >> she had this freshness, this -- this honesty that i found very rare. >> reporter: of course, he had no idea about the dark secrets in her past. coming up -- >> he's been my strength ever since i met him. >> reporter: a new romance and a stunning revelation. >> she broke down and started crying. i was willing to take any risks, whatever it was, in order to be with her. avoid contact with germs. just click it in and recycle! to enjoy continuous clean freshness with every flush for up to one week. lysol click gel keeps it clean with one click. lysol. start healthing. i'm going to share a photo of my eggo waffle when it pops up. that's so interesting honey because i'm going to share a photo of my eggo waffle when it pops up. l'eggo my eggo l'eggo my eggo (answering machine) hey! leave a message. hi, i know you're there, 'cause i can see you. i'm calling you to tell you to l'eggo my eggo! anncr: some things are too delicious to share. golden crispy, warm and fluffy eggo waffles. l'eggo my eggo. why am i so awake? did you know your brain has a wake system... and a sleep system? science suggests when you have insomnia, the neurotransmitters in your wake system may be too strong, which may be preventing you from getting the sleep you need. talk to your doctor about ways to manage your insomnia. good job! still running in the morning? yeah. getting your vegetables every day? when i can. could've had a v8. original. or one of our new veggie blends. all 60 calories or less. i'm kinda known for my impressions. so here's my impression of a sirloin third pound burger from mcdonald's if you don't get one soon. that's right! gone! also... did that feel like 100% sirloin to you? because it felt like 100% sirloin to me. 100% north american sirloin. 100% limited. try all three sirloin third pound burgers at mcdonald's enjoy this lovin' while it lasts. ♪ >> reporter: at just 20 years old, patricia esparza had experienced a life-time of unbelievable tragedy. she says she was sexually abused by her father; raped in college; an ex-boyfriend allegedly murdered her rapist, and then she was secretly forced to marry that ex to keep him out of jail. she says it nearly broke her until she met someone special. >> this was really a fresh start for you? >> yeah, absolutely. >> meeting jorge. >> yes. absolutely. he's a wonderful, wonderful human being. >> reporter: his name was jorge mancillas. >> what was it like the first time you laid eyes on patricia? >> when i met patricia, i saw this tiny, little woman who was intelligent, very well-organized a real leader. she was inspiring everyone around her. >> reporter: patricia, now 25-years-old, fell for jorge while they worked together on a california political campaign. >> did you two have an instant connection? >> i certainly was taken by her very, very quickly. we both came from very limited environments in mexico. we both had worked hard to open up opportunities for ourselves through education. >> reporter: just like patricia, jorge was a high achiever, with a ph.d. in neuroscience. they both had degrees in psychology. and one thing he particularly admired in patricia was her desire to help people. >> she wanted to get a ph.d. in, at de paul university because they had this children's clinic. because she wanted to help the children learn how to deal with the difficult circumstances she faced as a child. >> reporter: it wasn't long before the 48-year old decided he wanted to spend the rest of his life with patricia. he proposed to her at new york's world trade center in august of 2001. >> patricia was thrilled when i proposed to get married and she of course accepted. >> did you feel like finally my life has taken a turn for the better? and maybe i can put all of this behind me? >> oh, absolutely. absolutely. he's been my strength ever since i met him. >> reporter: but within hours of that proposal, everything suddenly turned upside down. >> that night, she broke down and started crying and told me that she couldn't marry me 'cause she was already married. that it was a forced marriage, not a real marriage. but she couldn't tell me the circumstances, 'cause she felt it would put me under risk. and she didn't want me to -- to live under the threat she was living under. >> so this is the first time you're hearing about her past? >> yeah. she refused to tell me and she was crying and she -- i had never seen her like that. >> reporter: patricia says she begged jorge not to ask her details about her first marriage. >> he was very respectful of my privacy. he didn't ask me. i told him not to -- not to ask me because i wasn't able to tell him. and he said, "well, whatever it is, we're going to deal with this together." >> reporter: the couple faced a dilemma. they wanted to become husband and wife but of course couldn't since patricia was already married. so jorge hired a lawyer and patricia ended up telling that attorney everything. >> after she talked to this lawyer he told me that he couldn't share the facts with me. but that she was right, that it was better for me not to know. >> reporter: one thing he did know was that he really wanted to marry patricia. so he asked that lawyer to help. after three long years of negotiations, nine years after the murder, gianni finally agreed to a divorce. jorge and patricia soon got married. but jorge still didn't know her deep secrets. >> weren't you so curious why? >> oh i was curious. i was completely mystified by why it was and what it was that was so threatening. >> was it because you loved her so much you were willing? >> oh i not only loved her, but i realized how unique she was. i felt so at ease with someone who i felt i could completely trust that i was willing to take any risks, whatever it was that was lurking in her past, in order to be with her. >> reporter: in 2004, the couple wed. life moved on and they relocated to a small town in france. both commuted to jobs in nearby geneva. patricia worked for the world health organization as a consultant, and became a psychology professor at a local university. five years later, in 2009, came another life-changing event. the couple welcomed a daughter, arianna. >> after all that you have been through, what was that like, the birth of your daughter? it must've been almost like a rebirth. >> oh my goodness. i know that every parent knows how different the world looks once you have a little tiny, little human being looking up at you. you feel that you want to go out there and actually create a better world. >> reporter: finally, patricia had a loving husband, a happy family. a successful professional career, she even rubbed elbows with the likes of hillary clinton. it was the life she always dreamed of. the secrets, lies, the murder, all seemed to be hidden away on the other side of the world. 6,000 miles away a prosecutor wasn't ready to move on. he didn't care that this was now a 15-year old cold case. >> sometimes things that seem like a big blow are the best thing that could happen to a case. >> the best evidence was yet to come? >> in this case, it wasn't scientific breakthroughs. it was time. >> reporter: coming up -- an explosive new detail. another woman, there at the club that night! >> that finally gave us the connection that we needed. >> reporter: the past she thought she'd escaped, is about to come charging back. >> she had lied and i wanted to see why she did that. >> reporter: when dateline continues. 3 f2 y quería saber por qué. ♪ who does this kinda thing online? i-i-i clicked on some links, ugh the kids weren't even home. wait, wait, wait, this cha it's cars.com service & repair feature. so we'll never pay more than we should. well done. research, price, find. get the right service without all the drama. taxi! sorry to stop you, but i noticed your windshield's dirty. you want a big tip? sparkle paper towels are great for cleaning glass without cleaning out your savings! watch sparkle go to work on this dirty windshield. check your oil... it even works on this little thingamajig. which one of these pedals makes it stop?! sparkle. 'cause it's a messy world out there. new dannon oikos triple zero is my go to protein snack. protein from yogurt? yup, this greek nonfat yogurt packs 15 grams of protein punch. but what else? it has 0 added sugar 0 artificial sweeteners and 0 fat. mmm... dannon oikos triple zero mmm dannon. i'm really psyched subway is bringing the flavor with this new guacamole for a couple of reasons. first, people really love our guacamole. rich and creamy, made from hass avocados and just a hint of jalapeno to keep it interesting. the other reason is, it's just really fun to say. guacamole guacamole guacamole guacamole guacamole guacamole see? come in and try our new guacamole on sandwiches like the chipotle chicken melt. and discover how it turns up the flavor on all your favorite sandwiches. subway. eat fresh. >> distinguished career. devoted husband. darling new daughter. professor patricia esparza now had the life she'd always wanted. she thought she'd buried the secrets of her past. but a family in california could not forget what happened 15 years ago. and investigators would not let it go. kidnapping, murder. it turns out there was more to what happened that night than the professor had let anyone know. again, andrea canning. >> reporter: while patricia esparza was building her perfect life as a professor, a wife and mother, the murder of gonzalo ramirez remained unsolved. gonzalo's two daughters were just toddlers when their father was killed. by 2010, they were young women, growing up in mexico with just some photographs to remember him. >> it's not the same. it was very hard. >> it felt like we really wanted him to be there. >> reporter: gonzalo's brother carlos saw the pain. >> i see on their eyes they get sad. you know? it's -- it's -- it's really sad. >> reporter: carlos and his brother benito were left with so many questions. >> we felt frustrated, because we didn't -- we couldn't find out what -- what -- what happened. why my brother was killed. and we didn't know nothing. >> reporter: investigator dean fulcher had carefully reviewed the case file from the mid 1990s. >> what did you wanna take a second look at? >> at that time, dna in -- in the mid-'90s was fairly new, but it was also advancing rapidly, so i just simply requested that the crime lab reexamine the blood. >> reporter: the blood found in the transmission shop. the shop that the prime suspect gianni van had access to. the original d-n-a test said the blood might be gonzalo's, but it was far from certain. >> was there something different the second time around? >> yeah, there was a significant change. although the crime lab couldn't say it was definitely mr. ramirez, the numbers were astronomical that it had to be his. >> reporter: more sophisticated testing led to a stronger conclusion. >> mr. ramirez had been inside that transmission shop. >> reporter: so, in 2010, 15 years after the murder, investigator fulcher brought the case to prosecutor mike murray who was known for his work on cold cases. murray, in turn, contacted gonzalo's brothers. he says they were surprised to >> both brothers said that they had figured that with all the years that had -- that had gone past since gonzalo's murder that nobody was paying attention anymore. that he was just another young hispanic man who had been killed. and the police probably weren't even investigating the case anymore. >> reporter: the confirmation of gonzalo's dna in the shop was an important step, but the prosecutor knew they needed more. a strong gonzalo ramirez and his suspected killer, gianni van. >> we still needed to establish how it is that gianni would have known who it was who allegedly raped ms. esparza. >> was that kind of the missing piece all along? >> to me, that was. >> reporter: patricia was the key to helping them connect the dots. but, as far as the authorities knew, she was still married to gianni and could not be compelled to testify against him. >> i was constantly running their social security numbers, all their information, finding out where they were. i would then try to locate a divorce certificate, wherever they were. >> so you're just constantly doing random record checks? >> correct. >> reporter: it took years of random checks. but finally, the detective got a hit for patricia in chicago, where she had attended graduate school. with one phone call he learned patricia and gianni were no longer married. >> how did that feel, after all those years, that you finally get a hit on a divorce certificate? >> it felt good. there's no doubt about that. >> reporter: he immediately caught a plane to chicago. >> our next move was to just show up at her doorstep and try to have a conversation with her. >> "surprise?" >> right. >> "we're here?" >> yes. >> what happened? >> well, we got to chicago and we found out she had married and moved to europe. >> reporter: moved to france. out of his jurisdiction. >> was it a bit of a game of cat and mouse with patricia? >> yeah, you could call it that. >> reporter: fulcher's partner wrote an email to patricia asking for her "assistance" in their investigation. he wrote, "i hope you believe me when i tell you that you are not a person of interest nor are you a suspect in this case." >> did you all believe that at the time, or was that more of a little technique to get her out of the -- the rabbit hole? >> i think there was a thought process amongst all of us that we honestly didn't know if she was involved or not, and my intent, if we could ever get a interview with her, was to try to get her to give us the information we needed to arrest gianni. >> your primary goal was to talk to her? >> correct. >> reporter: but the email didn't work. patricia wouldn't agree to be interviewed. however, investigators didn't stop there in building a case. if prosecutor murray couldn't get patricia to testify, he needed to find someone else who could link gianni and gonzalo. >> is it like finding a needle in a haystack, finding that person to shed light on that? >> as it turns out, no. >> reporter: re-reading the file, he noticed a name: nancy luna. she'd been with patricia and her sister the night they'd met gonzalo at el cortez. murray sent investigator dean fulcher to re-interview her and when he did, luna told him something that changed the case completely. she said that patricia brought gianni to the club and identified gonzalo as the man who raped her. >> she told her boyfriend who gonzalo ramirez was and brought him back to the club and pointed him out to her boyfriend. >> reporter: this was a bombshell. patricia had told police all along she didn't know anything about the murder. now, a new witness could place patricia in the club with gianni the night gonzalo was killed. >> did that change the focus of patricia? >> it certainly made me realize that patricia was involved. >> reporter: it also made him take a fresh look at everything patricia had said to police. it led to a disturbing conclusion. >> even after knowing that gonzalo ramirez had been brutally murdered, she was willing to sit down at the age of 19 or 20 with hardened homicide investigators from the santa ana police department and look 'em in the eye and lie to them repeatedly. >> reporter: now murray had a stronger case against gianni, and he was starting to think he might have a case against patricia as well. so of course, he wanted to question patricia. >> i wanted ms. esparza to know that we knew that she had lied and that she had tried to derail a murder investigation for 20 years. i wanted to see why she did that. i wanted to give her an opportunity to explain why she would marry the person who seemed to be the prime suspect in a brutal murder. >> reporter: but remember, patricia was in france. out of reach. >> when somebody's in another country and you don't have jurisdiction, there's not a lot you can do. she was not willing to speak. which was her right. she didn't have to. >> reporter: their only hope was that she would return to the u.s. so they put her name on the homeland security watch-list in case she did. the next move was hers. >> so we waited. >> waited for? >> ms. esparza to come back to the united states. >> reporter: coming up -- a surprise for the professor. >> that was the longest night of my life. >> reporter: and another for investigators. >> gonzalo was there at the club. and i -- i identified him. >> did any of the details surprise you? >> i didn't realize she was involved as deep as she was. looking for one of these? yoplait. smooth, creamy, and craved by the whole family. quiet! mom has a headache! had a headache! but now, i...don't. excedrin® is fast. in fact for some, relief starts in just 15 minutes. excedrin®. wow, that was fast. >> reporter: october 2012. seventeen years after the murder of gonzalo ramirez, prosecutor mike murray got the call he'd been waiting for. patricia esparza had boarded a plane in geneva headed for the u.s. >> i know you're a patieock when you got that call? >> it was a bit of a shock. and i was getting impatient. >> do you just hop on a plane to go talk to her? >> that's exactly what we did. >> i was coming to the u.s. for professional travels and boston was a layover for me. >> reporter: she made her way through customs at logan airport and handed her passport to the customs officer. >> i noticed something was wrong when he stopped talking, and he started to turn red. he asked me for my social security number to make sure that i was the person that was on the screen. and i realized at that point that something -- something was wrong, that this was not a regular procedure. and that's when they -- he gave a document to another woman, another officer who took me to a back room, searched through my luggage, and then handcuffed me. >> reporter: patricia had no idea that murray was about to confront her with new evidence -- and new suspicions -- about the role she may have played in gonzalo's murder. >> that was the longest night of my life. >> reporter: the meeting happened at a holding facility in the airport. >> i wasn't naive. she had lied to investigators in 1995. she'd married the primary suspect in the case. she had a life in france that i'm sure she didn't want to give up. i was reasonably certain that she wasn't gonna talk to us. >> did you get anything? >> no. we didn't. >> that must have been really frustrating. >> to me, it was more about giving her that opportunity and having her remember that opportunity later down the line. >> reporter: murray then delivered a big blow patricia never saw coming -- he charged her with first degree murder. >> was that just a complete shock? >> oh, absolutely. and the first thought that ran through my head was what is going to happen to my daughter? >> reporter: she called her husband, jorge mancillas, who was back in france with their 3-year-old daughter. he knew patricia had a dark secret, but never knew how dark. >> are you thinking now i need to know? >> oh, i need to know -- >> i need to know what happened. >> so she told me the basic points of the case and then i immediately started searching, now that i had names, now that i had some information. >> reporter: patricia was brought back to orange county, to a jail in santa ana. >> i felt as if i was transported into a different planet when i went into jail. i mean, that is a world that was completely just unknown to me. how you have no control over what you eat, when you eat it, where you eat it, when you sleep. everything is stripped away from you. >> reporter: the prosecutor hoped some time in jail, with a murder charge hanging over her head, might finally cause patricia to break her silence about what happened to gonzalo ramirez. >> i made it very clear to her attorney in the beginning that i was interested in speaking to ms. esparza if that was something that she wanted to. that i couldn't make any promises about what would or wouldn't happen with her case, but that i would give her an opportunity to make an immunized statement. we would assess what it is that she had to say. and then we would decide whether we would offer her anything or nothing. >> reporter: patricia spent two months behind bars. finally, in december 2012, she broke. behind closed doors, patricia and the prosecutor came face to face once again. >> i don't know if you remember, ms. esparza. >> yes. >> i met you -- >> uh-huh. >> in boston. >> reporter: with her lawyer sitting next to her, patricia finally opened up, starting with the encounter with gonzalo ramirez all those years ago in her dorm room. >> as i struggled more he, he became a bit more aggressive. um, i was pushing him back and, um, uh, at some point he pinned me down and, uh, i was wearing a pair of jeans and, uh, he took those off. >> reporter: she told the prosecutor how she then confided in gianni about the alleged rape. >> that infuriated him. he got really upset. he asked me who was it, and i told him his name is gonzalo. where'd you meet him? i met him at el cortez. >> reporter: and for the first time with investigators, she admitted that she was at the club the night gonzalo was killed. >> i remember gianni being really, um, on edge that night. and i just felt, i felt so much pressure at that point. and we went to el cortez. we were there for, i don't know how, i actually don't know, don't know, but gonzalo was there at the club. and i identified him. >> when gianni told you he wanted you to point this guy out in the club, did he tell you what he was gonna do? >> uh, intimidate him, scare him, rough him up. >> reporter: the long-cold case turned white hot. police thought they finally had enough evidence and arrested gianni van a second time for the murder of gonzalo ramirez. and, this time, they made more arrests, two other people who were at the transmission shop that night. >> it was clearly a plan. they had identified gonzalo ramirez at the club. they'd followed him from the club. they'd staged a car accident. they'd kidnapped him. they'd taken him back to a transmission shop from santa ana to costa mesa. and then they dumped his body in irvine. that didn't just happen spontaneously. >> reporter: all of them pleaded not guilty. it took a long time, but gonzalo's family felt they were finally getting some answers, and possibly justice. >> we tell the prosecutor, we tell the detectives, "we trust in you. we trust you guys." i hope these guys gonna get what they deserve for the crime they did. we still trust in the laws of california. >> reporter: now authorities had to consider the fate of patricia esparza. on the one hand, her cooperation made the case against the other defendants. on the other, she had admitted to playing a role in the murder. investigator dean fulcher. >> did any of the details surprise you about what patricia had to say when she finally broke her silence? >> yes. i knew she was the catalyst for this whole thing, i knew she had some involvement. i didn't realize she was involved as deep as she was. >> reporter: just how deeply? as you'll see, that would become a matter of dispute. but in return for her cooperation, patricia was granted bail and allowed to keep her passport, meaning she could return home to europe. >>in 20 years, i've never agreed to recommend bail on a special circumstance murder case. >> why now? >> she was willing to use her mother's home as collateral. and said that she would come back for any subsequent hearings. i didn't believe that she would jeopardize her mother's home and financial security and flee. >> reporter: her husband, jorge mancillas, was back in europe, trying to understand the secret his wife had kept from him for years. >> i couldn't understand how she could have been living with such traumatic events in her past. i was very moved that she tried to protect me. because then i understood what was the threat for me and our family. >> there was no anger. "she should have told me. i should have known what was going on." >> no. i felt frustrated, because i thought that perhaps i could have done something had i known what the circumstances were. >> reporter: patricia arrived home just before christmas. >> i cherished every minute in the day when i was with my little daughter when i went back to geneva. i felt so blessed and so fortunate that my life had been given back to me, the life that we had worked so hard to create. >> those days around christmas and new years were very happy. we thought the nightmare was over. >> reporter: but the nightmare was far from over. coming up -- defiance. >> he is willing to destroy a family knowing that i'm innocent. >> reporter: the professor -- and her husband -- strike back. >> i knew her heart. i knew her soul. this is the prosecution of an innocent woman. >> reporter: when dateline continues. at red lobster's create your own seafood trio... ...if it looks tasty you order it. choose 3 of 9 dishes for just $15.99. like baked lobster alfredo. brown butter shrimp scampi. and soy-ginger salmon. hey, this is my plate. get yours while you still can. we need coffee. got it right here. cups? 12 ounce, 8 ounce, recyclable... creamers? sweeteners? stirrers? filters? creamers, sweeteners stirrers, filters, k-cups... hazelnut? french vanilla? french roast? dark? light? medium? bold? extra bold. and decaf. why would you say that? why would you say that? why would you say that? no reason. make on-budget happen. make caffeinated happen. staples. make more happen. are you so congested... it feels like that brick's on your face? try zyrtec®-d to powerfully clear your blocked nose and relieve your other allergy symptoms. so you can breathe easier all day. zyrtec®-d. find it at the pharmacy counter. 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[sfx: yeti noise] ♪ we are farmers bum - pa - dum bum - bum - bum - bum ♪ jump into kohls super saturday for over 100 early birds starting at 8am! girls shorts 8.99 and boys shirts 8.99 take 55% off home decor save extra on select kitchen electrics mens polos for 15.99 womens tops only 7.99 sandals 14.99 boys shorts only 8.99 and you'll walk away with kohls cash! this saturday is super saturday! at kohls >> reporter: many of the details of the murder plot that began with a strange kidnapping at this intersection in santa ana remained a mystery for almost 20 years. that was until patricia esparza was arrested and finally agreed to speak with investigators about the night gonzalo ramirez was killed. >> i was completely in shock. i felt it was clearly orchestrated and here i am, oh my goodness, it had to be orchestrated. >> reporter: but her role in the case, and the killing was far from clear. was she a victim? a witness? or something much more sinister? she had certainly allowed gonzalo ramirez's family to sit for 20 years and wonder what had happened to their brother, what had happened to their father. >> do you think patricia esparza is just as responsible as the others? >> reporter: well, when you say "just as responsible," if you're asking if somebody aids and abets in a crime and is a willing participant in a crime are they just as responsible in the eyes of the law? are they guilty of that crime? the answer is yes, unequivocally. yes. are they morally as responsible? maybe not, maybe not. patricia, charged with first degree murder and out on bail was offered a deal in exchange for her testifying against her ex-husband gianni van and the other co-defendants. the deal plead guilty to voluntary manslaughter and serve three years in prison. in november 2013, patricia returned voluntarily to the united states for her next court hearing. at that time, the prosecutor was hopeful the deal was done. had other plans. she would take her case to the court of public opinion. she and her husband called a last-minute news conference outside the orange county courthouse. >> good morning. thank you for your patience. this is my wife, dr. norma patricia esparza. >> reporter: dr. esparza has been charged with murder in the first degree with special circumstances, which carries the possibility of life in prison without parole for a murder she did not commit. she is being charged for the murder of the man who raped her 18 years ago. standing with her 4-year-old daughter arianna, patricia made a very public statement aimed directly at the district ey. >> it is unfortunate that he is willing to destroy a family, that he is willing to strip me away from my daughter knowing that i'm innocent. it is unfortunate and for that reason, we're coming forward and talking to you about it. >> reporter: she announced she was going to refuse the plea deal. she would not take the witness stand in the case against gianni van if it meant she had to plead guilty. >> the principle of what they're asking me is to plead guilty to something they know i am not responsible for. it's essentially something that i cannot accept because it would essentially be a lie. >> reporter: plus, she said, a conviction and prison sentence would destroy her professional reputation as a psychologist. >> this is not america. this is not justice. this is abuse of power. this is the prosecution of an innocent woman who has never harmed anyone. >> reporter: the news conference struck a nerve around the world. >> welcome back. on crime and punishment tonight. a college professor. >> she was the one who set things in motion. >> reporter: patricia quickly gained supporters who saw her not as a suspect, but as a rape victim charged with a murder she didn't commit. the day after her news conference, patricia appeared in court. after she officially turned down the prosecutor's plea deal, the judge issued a ruling. >> i do find that the circumstance have changed. this matter is going to no bail. >> reporter: patricia was handcuffed and sent back to jail. her husband gave her one last hug as she was led away. and with his wife behind bars, he soon returned to europe with arianna. >> how do you explain to a four-year-old daughter what's happening to her mother? when she asked me where mommy is, i'm unable to explain to her. so i just tell her, "mommy will be back. mommy will be back soon." and i'm committed to do everything to make sure that happens. >> reporter: jorge worked to drum up support for patricia. thousands of people signed a change.org petition. >> was there any doubt in your mind that she was telling the truth? >> i believed patricia's story immediately. there was no doubt in my mind. i knew her heart. i knew her soul. and i had no doubt that patricia was innocent of any wrong doing. i wanted to know the facts. i wanted to understand how it is that she was entangled in a situation like that. >> reporter: she had told her ever-changing story to police, to the prosecutor, to her husband. but how much would she be willing to tell us? >> it haunts me. and it has haunted me for the rest of my life. >> reporter: coming up. >> he was still alive when they brought you to see him? >> yeah. >> what was the truth? >> i was dragged, pressured, bullied, intimidated. >> reporter: her full story at last. >> he destroyed the rest of my life! ♪ ♪ ♪ relay for life. help the american cancer society finish the fight. donate now at relay.org there are a lot of channels on your tv but only so many you want to watch what if you could pay for the types of channels you want and not the ones you don't now, fios brings you a totally new way to customize your tv, at a price that's totally affordable. starting at $74.99 per month. get custom tv, including internet and phone. price guaranteed for two years. plus, get a $300 visa prepaid card with your 2 year agreement. go to getfios.com today. cable just gives you channels. fios gives you choice. call the verizon center for customers with disabilities at 800.974.6006 tty/v >> reporter: patricia esparza, the petite psychology professor, was now an inmate wearing a blue jumpsuit. she was allowed to change her clothes for our interview. we sat down just days after she was ordered back to the orange county jail in 2013. >> do you ask yourself, "how did i get here?" >> absolutely. absolutely. i rewind so many events in my life. i rewind so many things in my mind, especially being here and having so much time to think about how things progressed. i just ask myself so many questions. >> reporter: she said for a year she answered the prosecutor's questions and even testified before a grand jury. >> i had no idea. i had no idea. i was going to revisit that night again, and again, and again during these last 12 months. it's been -- it's been so difficult, because i feel re-traumatized every time i talk about it in an unsafe setting. i feel that i'm taken back to those moments, and i get flashbacks. and i start to feel panic attacks. and i have to really contain myself, and bring myself back. >> reporter: her cooperation led to murder charges for her ex-husband gianni van, and two alleged accomplices who prosecutors say were involved in the death of gonzalo ramirez. but what about patricia herself? what was her role in all of this? the prosecutor said she was legally responsible for the murder, because she had set it in motion when she identified gonzalo at the club. but patricia told a very different story -- that she was an innocent victim at the mercy of gianni van. >> i would go home to my mother's home on the weekends. and that's when he took the opportunity to drag me through that whole night, and the chain of events that took place that night. >> reporter: patricia told us that three weeks after the alleged rape, gianni suddenly showed up at her door. >> he said, "let's talk. let's -- yes, continue to see where we can go." i got in his car. and once i was in the car, he took matters into his own hands. >> does he bring other men into the picture -- >> yes. >> -- at this point? >> yes. >> and does he tell you his intentions? >> never. never. >> reporter: she says she was too frightened to do anything but go along. >> i was traumatized by the rape. i was still depressed. i was still weeping. i was still in distress. and he took advantage of that. and he took advantage of that state. >> did they take you to the bar where you had met gonzalo? >> i don't want to revisit details that my lawyer has advised me not to revisit in the interview. >> reporter: patricia did fill in the blanks for investigators about the rest of that night. gianni and the others, she said, drove her to the club. they went inside and insisted she point out gonzalo ramirez. when he walked by, she told gianni that was him. when they left the club, she watched as they rear-ended gonzalo's truck. when he got out to check the damage, the men forced him into the white van and drove him to that transmission shop. patricia said she waited at this nearby bar and then later that night, she was driven to the shop and led up a small staircase to a loft. >> did you see him being beaten? >> no. no. i didn't see when they were actually beating him, they made me witness the aftermath of the beating. >> so he was still alive when they brought you to see him? >> yeah. >> and how -- what kind of shape was he in at that point? >> he -- not in good shape. >> did he know it was you? did he remember you? >> i don't know if he did or didn't. i just -- at that point, i just knew that they were doing all this to punish me. they were mad at him for what he did, but they also were punishing me. >> what were they punishing you for? >> for having allowed it to happen. for how -- somehow not stopping it. >> were you able to say anything to gonzalo before he died? >> no. no. i was -- i was in shock, and i screamed, and i was -- i was just -- i was just in fear. i couldn't -- i couldn't possibly. yeah. i wasn't able to. >> reporter: patricia told us that was the last time she saw gonzalo. his hands were tied with chains in the loft of that transmission shop, but she says she didn't find out he had been murdered until much later. >> what i can tell you is that i was dragged, pressured, bullied, intimidated into that night when they actually took gonzalo ramirez, kidnapped him, beat him up, and ultimately killed him. i never saw him dead. but i was terrorized by the violence that i was -- that i witnessed. for me, these people were so foreign to me. they were just -- i didn't know who they were. i just knew that they were dangerous, and they were violent. and that scared the living daylights out of me. i feared for my own life. >> did you tell gianni you wanted to seek revenge on gonzalo -- >> never, never. >> did you convince him to go there that night -- >> never. >> to kill gonzalo? >> never. >> reporter: she says she too was a victim of gianni van that night. >> he destroyed the rest of my life. you know, the rape was difficult, but dragging me through that night, it haunts me. >> do you wish now that you had gone to the police? >> i wish that at some point, this whole cycle had been stopped, either by an adult, or by myself. but when you are traumatized, when you are raped, when you are terrorized, when you see what you saw, when these people are a mob, violent, i don't see how i could have possibly stopped it if it wasn't somebody coming forth and helping me. >> reporter: patricia said she was still willing to testify in gianni van's trial, but as she said before, it had to be on her terms. she was not about to plead guilty to voluntary manslaughter. >> perhaps it's 18 years later, but i don't think it's too late. i don't think it's too late to seek justice for him, and to seek justice for myself. the only justice i can obtain is to not be wrongfully convicted and taken away from my daughter's life. >> some might say it's quite the gamble to decide not to take a plea deal, and you know, as few as say three years, when you could get life in prison. why take that chance? >> i never wanted gonzalo ramirez to be harmed. and i had to look deep within myself. i had to reflect on who i was, think about my conscience, and what could i live with. and i can't live with the guilty plea. i could face life in prison. i will be stripped of my daughter's life for the rest of her growing years. and that's a risk. but i'm trusting that the district attorney will know that we're both seeking the same goal, that we both want justice for the man who raped me, and justice for myself. we are both unfortunate victims in a horrible series of events. >> reporter: a horrible series of events, to be sure. but patricia esparza a victim? the prosecutor wasn't buying it. >> she was a very educated woman. >> manipulative, in your eyes? >> yes. >> reporter: coming up -- another woman there that night, with yet another revelation about patricia. >> she's using other people to exact her revenge. >> some might describe patricia as a mother, a phd, a wife -- >> you could still add to that list "murderer." >> reporter: when dateline continues. your allergies bring more than sneezing... ...and itchy eyes. they also bring tough nasal congestion. so you need claritin-d. it starts to work... ...in just 30 minutes. in fact, nothing works faster. so blow away nasal congestion, fast, with claritin-d. our pizza hut big flavor dipper pizza is almost two-feet of pizza. whoa. you're gonna need a bigger car. get the new big flavor dipper pizza with four flavorful sauces and a free pepsi 2-liter with online orders. just $12.99. only at pizza hut. ♪ ♪ [ male announcer ] you wouldn't ignore signs of damage in your home. are you sure you're not ignoring them in your body? even if you're treating your crohn's disease or ulcerative colitis an occasional flare may be a sign of damaging inflammation. and if you ignore the signs, the more debilitating your symptoms could become. learn more about the role damaging inflammation may be playing in your symptoms with the expert advice tool at crohnsandcolitis.com. and then speak with your gastroenterologist. >> reporter: as patricia esparza sat in an orange county jail, there was another inmate who also faced charges in the murder of gonzalo ramirez. her name was diane tran. and what put her in jail was patricia's statement to investigators. she said there were several people involved in the murder, and one of them was diane. >> from outside of the door, right outside a male voice said, should we kill him. i heard sort of a resounding yes from everybody. >> okay. >> but the one who, who's, who struck me in saying yes was diana. >> okay. >> only because i didn't expect, i didn't expect her. >> reporter: remember the transmission shop where patricia saw gonzalo in chains and police found his blood? diane tran owned that shop with her husband kody. kody, too, was a suspect in the murder but committed suicide before police could charge him. that left diane. her defense attorney was robert weinberg. >> how is she doing? >> she is under so much pressure, the loss of her freedom. to say it's a shock is an understatement. >> reporter: according to diane's attorney, kody was part of the group that killed gonzalo. but diane was only at the shop because he forced her to be there. >> kody tran was a very, very difficult character to live with. very volatile, violent. >> i would say that she was subject to his commands. come to the shop. come with me. we are going. >> reporter: in other words, diane's story was much like patricia's. she says she was an unwilling participant, a wife who went along out of fear. >> diane had nothing to do with this at all. >> reporter: so, when patricia esparza turned down her plea deal and refused to testify, a door opened for diane tran. >> and you're willing to plead guilty to the new charge and the enhancement and receive a possible sentence of up to four years in prison? >> yes, your honor. >> reporter: diane made a deal with the prosecutor, pleading guilty to a reduced charge of voluntary manslaughter. in exchange, she agreed to testify in the case against patricia. and her testimony would be explosive. diane said patricia wasn't forced into anything, but instead took part in planning the murder. >> gianni was talkin' about wanting to find this guy and retaliate. according to diane tran, those discussions about retaliation all began immediately. ms. tran also indicated that there were conversations that took place where she was present, where gianni talked about killing gonzalo ramirez, where ms. esparza was present. and that ms. esparza knew that the plan was to kill gonzalo. >> reporter: a claim, remember, that patricia strongly denied in our interview. >> and does he tell you his intentions? >> never. never. >> reporter: investigator dean fulcher believed that patricia not only knew what gianni was planning, she may have orchestrated it. >> when you started peelin' back the layers, you find that there was a individual who i think, is a very manipulative person, who was kind of pullin' the strings and all the time claiming to be the victim while she's using other people to exact revenge on the individual she feels raped her. >> reporter: but many people did see patricia as a victim, and a movement calling for her freedom was building. supporters attended court hearings wearing t-shirts that read "set patricia free." >> we're here to stand in solidarity with her and as with other sexual assault victims across the world. >> reporter: many saw an accomplished woman who had overcome terrible trauma, only to be victimized again by the legal system. >> there are two victims here. i hope that the d.a. finds it in his heart to strengthen his case and really get justice for those who committed this crime and stop persecuting the other victim in the case. >> reporter: but that didn't seem to faze the prosecutor. >> i knew that she had hundreds, if not thousands of supporters who had never read a single police report, never listened to a single taped interview. she had 'em all convinced that -- that she was being wrongfully accused and that somehow it -- if she was a victim of a sexual assault, that she couldn't therefore also be a defendant in a murder case. >> so much time had passed. she didn't actually commit the crime. why were you not willing to let it go? >> they left a man on the side of the road like garbage. why should the fact that she lived a free life for 20 years be in any way mitigating? to me, it's aggravating. she got her time. she got to live as if she had never been involved in this incident. >> some might describe patricia as a rape victim, a mother, a ph.d., a wife, someone who has done good things for the world. how would you describe her? >> i think all those might be accurate. and yet, you could still add to that list "murderer." >> reporter: a tough prosecutor poised for trial with one more move up his sleeve. >> it was another one of ms. esparza's lies. >> reporter: coming up -- >> did you tell patricia "i think we can win this?" >> i did tell patricia i thought we could win this case. >> reporter: 18 years of secrets. one momentous decision. >> guilty or ♪ there are no medals won for earning a living. it's just what you do for family. but it's hard to build a future if you can't see past today. that's why walmart is investing in the most important part of our company - our people. because a raise in pay, raises us all. introducing a whole new way to enhance your eyes. it's 1-day acuvue® define™ brand contact lenses. the eye enhancement lenses that comfortably accentuate your eyes' natural beauty. ask your doctor today about 1-day acuvue® define™ brand. new dannon oikos triple zero is my go to protein snack. protein from yogurt? yup, this greek nonfat yogurt packs 15 grams of protein punch. but what else? it has 0 added sugar 0 artificial sweeteners and 0 fat. mmm... dannon oikos triple zero mmm dannon. nexxus introduces a new movement in hair. ♪ ♪ a beautiful fluidity. restoring strength and flexibility ♪ ♪ so it moves and responds the way you do. ♪ ♪ new improved nexxus with concentrated elastin protein and precious ingredients. for hair that lives to move. >> reporter: when seasoned defense attorney jack earley met patricia esparza, the psychology she had turned down a plea deal and was no longer cooperating with the orange county district attorney's office. patricia flipped the crime on its head, by calling herself the victim, that she had to witness this brutality. do you think that's a fair assessment? >> i definitely think it's a fair assessment. because i think that patricia would be the first to say that she would never want anyone to think that this was done in her name. >> reporter: but that's exactly what prosecutor mike murray believed. in his mind, patricia esparza initiated the murder, helped plan it, then obstructed the investigation by marrying the prime suspect so she wouldn't have to testify against him. the prosecutor believed patricia lied repeatedly for 20 years -- right up to the time of her arrest in 2012. remember, she told us she was on her way to the u.s. for a conference. >> i was coming to the u.s. for professional travels. >> reporter: it turns out, says the prosecutor, she was really flying to boston to meet a former boyfriend. >> a gentleman arrived at the airport. and that gentleman said that he was there to pick ms. esparza up. and that she had agreed to come and stay with him in connecticut for a week at his home. >> reporter: that's kind of an interesting turn of events. >> interesting. not particularly significant to the murder investigation. just interesting that ms. esparza continues to lie when it suits her needs. >> reporter: and there was yet another inconsistency that was relevant to the case. patricia told us, you may recall, that gianni van forced her to marry him. >> i feared for my life. >> reporter: but take a look at these photos of patricia and gianni, a seemingly happy couple. all of them were taken after the murder, after they had secretly married. and, according to the prosecutor, it's possible the biggest lie of all was the reason for the murder in the first place. that patricia had been raped. >> she claims that she told the nurse from the clinic at pomona college that she was raped. >> reporter: but there is no record that she did. according to the medical records, patricia was examined by both a doctor and a nurse that day. but the notes from the visit only said patricia had "unprotected" sex and wanted a morning after pill, no mention of a rape. we contacted pomona college about patricia's visit to the clinic. they told us that given the two decades and personnel changes since patricia was treated, they had "no further information." what was your gut telling you about the rape? did you believe that patricia was really raped? >> anybody who's sexually assaulted, it's a horrific experience. i can only imagine. i don't know. there just isn't enough evidence. it's inconclusive. >> reporter: patricia and the prosecutor remained at odds and he pushed ahead for her trial. the d.a. was playing hardball with her. >> he was playing hardball. >> reporter: did you tell patricia, "i think we can win this"? >> i did tell patricia i thought we could win the case. but i also told her, "i'm not the one who does the time. i was able to raise my children. that's not a decision i have to make." >> reporter: meanwhile, the date was set for gianni van, patricia's former husband, to face a jury. patricia was running out of time. any possibility of a plea deal would have to come before gianni's trial so she could testify for the prosecution. so she instructed her lawyer to see if a deal was still possible. the clock was ticking. was it just tearing her up? >> she had a lot of traffic in her mind as to what that decision meant to a lot of people, including her husband, her family, groups that were supportive of her. so it was a very, very difficult decision. >> do you have any questions about what you're doing her today? >> no. >> reporter: patricia's decision came on the same day the trial for gianni van was set to begin. >> did you have an opportunity to read this plea agreement? >> yes, sir. >> did you discuss it with your lawyer? >> yes. >> ma'am, as to a violation of count two, voluntary manslaughter of gonzalo dominguez ramirez. how do you plead, guilty or not guilty? >> guilty. >> reporter: guilty of voluntary manslaughter. patricia had backed down. her sentence under this new deal -- six years in prison. according to the prosecutor, everything they had learned made the case against patricia stronger. she turned down the initial three-year plea deal. she ended up getting six. does she regret that decision at all? >> well, of course she regrets it in that way. that was another discussion we had. because you have to live with yourself. >> reporter: did you feel like justice had been done? >> that's a hard question to answer. did i feel like there was some closure with regard to ms. esparza? sure. was it justice? no. it's the way -- in many cases, you solve crimes. i don't think it was necessarily justice for gonzalo ramirez's brothers or his daughters. but it's what allows us to move forward with the rest of the case. it's what allows us to move forward with the trial against gianni van. >> reporter: gianni van's long delayed trial finally began last month, 20 years to the day aftero's death. >> the evidence is going to show that the defendant acted as judge, jury and executioner. >> reporter: the prosecutor said gianni committed murder to avenge the alleged rape of patricia. not so, said defense attorney jeremy dolnick. >> even though he was upset about the rape, he never had homicidal thoughts of revenge. he was the one that would prevent the fights, not instigate them. everyone knew him to be honest. they always good-natured kid. what happened in april of 1995 was way beyond anything that mr. van could have ever imagined or could have ever even possibly conjured up. >> reporter: patricia testified for the prosecution. gianni took the stand in defense. he said the other people in the transmission shop that night were the true killers. after just one day of deliberation, the jury reached a verdict. >> we the jury in the above entitled action find the defendant gianni van guilty of the crime of murder in the first degree. >> reporter: gianni van faces a sentence of life in prison without parole. the remaining co-defendant is awaiting trial. patricia has three and a half years left to serve. gonzalo's brothers say they were disappointed she got a deal because it was her accusations, her story, that led to the murder. >> she's very smart, and it's a criminal mind. she's a criminal mind. she knows how to play with the people. yeah. >> reporter: and so, after 20 years, the murder of gonzalo ramirez may be solved, but a big question remains -- who is the real patricia esparza? >> throughout the investigation, i saw her as potentially a victim, but as it progressed and as time went on and i learned more. the only word that i can come up with was "manipulative." i mean, she can manipulate people. >> reporter: but to those who support patricia, she's a woman who beat tremendous odds, went from poverty to a phd. and became a symbol for victim's rights, a role she now embraces. >> reason i went into psychology was to try to heal people precisely from the kinds of traumas that i experienced. i think that it's enough to be terrorized. it's enough to be abused. it's enough to be traumatized by a rape. and i've tried to seek a meaningful life where i can actually change people's lives. and that has been my objective. i'm going to put this behind me. i need to put this nightmare behind me. 3 f2 necesito poner esta pesadilla now at 11:00 searching for a motive in a quadruple murder. a family and housekeeper, victims of more than arson. >> blunt force or sharp object injuries. new evidence in the amtrak derailment.

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