Us, and they did. Reporter mark and karen were from big mormon families High School Sweethearts, who married as teenagers and watched their own brood quickly expand all boys jason jacob, tyler, troy and casey. Boys bursting with testosterone. It was of a rowdy house. We had Football Games inside the house. We were egged on by our parents, and they loved it. Reporter karen of a fulltime mom and once the boys were old enough taught part time at shasta college. For decades, mark got up at 2 00 a. M. To drive for u. P. S. Just because it freed him to coach his sons teams come afternoon and to spare his wife middle of the night disruption. Mark slept in a separate bedroom. Had for years. My dad treated her better than anybody could treat their wife. My mom of the queen. They lived simply. They lived paycheck to paycheck. They never had a lot extra. Reporter son tyler. For them it was all about family . Always. Reporter they stayed as close as any family could be. When jason got married, he moved into the house right next door helped celebrate mark and karens Silver Wedding anniversary as they all did. By 2012 they were grandparents many times over had been married nearly 33 years. One thing i always looked up to and loved about their relationship was that they still dated. Reporter tylers wife tina. After that long sometimes you can lose that and i never saw them lose that. Reporter the change does come for everyone. And by 2012 in their early 50s, mark and chairmen mark and karen were making changes. Karen went about School Nursing school. This of the plan they talked about . It was the perfect situation. She got to stay home with the kids all growing up and now she was of ready to start her her career. He was stay home, collect a pentagon, and she collect a pension, and she would start nursing. Reporter . So easy of course. Nursing school is a you toughtough thing. Her brother joe and his wife jackie. The commitments changed. Having grandma there when you need her having mom there when you need her. She was of going to have to study. She felt she should be doing better. I remember a tech that said i got back from the empare. R. Got the chance to work with final finally. I love of it. She was on her way. Reporter that may 4th casey joined his parents at home after his ball game. It being friday he and a friend went to see a movie, the avengers. Started at 9 15. And told my parent evers everything was fine. Reporter do you remember the last thing you said to your mom . Shea handed me a 20 dollar bill. I thanked her and left. Reporter it was almost midnight casey immediately fell asleep. What do you remember next . Put my head on the pillow, and two second later, doors open dads at the door freaking out. Reporter and the seconds later 911. Your emergency . Reporter the family of about to discover that a perfectly ordinary even human being ended d tragedy. Blood everywhere. Everywhere. Reporter when we return, a dad deaf stayed. Is one tragedy about to become two . I remember him coming in the door and collapsing falling on the floor. Thats why you need lysol. Because when you use bleach, some stains are left behind. As this dye reveals. Lysol toilet bowl cleaner does more. It removes the tough stains that bleach doesnt and it also disinfects. So why just bleach . With lysol you can do more. Thats healthing. And get max cleaning and freshness with every flush. Try lysol no mess max. Colourists know roots take colour one way, and previously coloured hair another. New Vidal Sassoon salonist. First, brush roots then, blend through lengths. Our most advanced system outside the salon. Its more than colour. Its a work of art. That detergent was like half the price and well have to use like double maybe more im going back to the store . Yes you are. Dish issues . Get cascade complete. One pac cleans tough food better than 6 pacs of the bargain brand combined. Cascade. Now thats clean. Lipton fresh brewed ice tea is the naturally refreshing way to enjoy your meals. Its the flavour we all savour does any food a favor. You gotta be ah more ah tea teariffic lipton. Be more tea. And now try iced tea in a squeeze. Ride away by roy orbison begins to play i ride the highway. Im going my way. I leave a story untold. He just keeps sending more pictures. If youre a freerange chicken you roam free. Its what you do. If you want to save fifteen percent or more on Car Insurance you switch to geico. Its what you do. Two wheels a turnin. Not all toothbrushes are created equal, oralb toothbrushes are engineered with end rounded bristles so brushing doesnt scratch gums and angled perfectly to remove 90 of plaque for a healthier smile. Trust the brand more dentists and hygienists use. Oralb. I found out the hard way. Not all washes take care of intimate odor. Vagisil odor block wash stops odor from happening for all day confidence. When you feel fresh all day you feel confident. Vagisil. Your intimate health experts. You get used to food odors in your car. You think it smells fine but your passengers smell this. Eliminate odors youve gone noseblind to for up to 30 days with the febreze car vent clip. Smells nice. So you and your passengers can breathe happy. Now may 5th, 2012. Casey duenas home from a movie and late dinner with friends opened the front door as usual and moved quietly down the little hallway toward his bedroom. Had it not been so late he probably would have stopped to say good night. But the house of dark everybody asleeping or so it looked to an exhausted casey who fell into bed and almost would inimmediately into a deep sleep. And then 25 minutes later dad takes place doors at the door freaking out, go next door go get jason, somethings happened to your mom. Get jason. Reporter he did as he was told running to his brothers house. 911. Emergency. Reporter his father, mark called for an ambulance. Tell me what happened. She i came in the room, i heard her. And shes got blood everywhere. Everywhere. I dont know i have no idea. You have no idea what happened . No. Oup whereyou dont know where shes bleeding from . No. Just blood everywhere. Are you with her now . Yes. Oh, its in her chest. Theres a gash thisin her chest. Reporter jason woke up to the horror two ways at once. Fire department alarm. Brother alarm. I wasasleep. As a volunteer firefighter i have a pager. I could hear the pager going off. Casey was ofsial yelling in a panic, theres something wrong with mom. You youve got the to. Reporter did you have any idea of what it was . I had no idea. Reporter it was a nightmare beyond dreaming. There was of his father in fullblown panic, and on the floor in a puddle of blood was his mother. The rookie firefighter for an instant to his eternal regret froze. If i would have come on that situation now, i would have immediately started cpr. There was a great deal of blood. So for somebody to live through that that much blood didnt think it was going to happen. I believe i you just missed her last couple of breaths. Reporter minutes later, emts arrived, and karen duenas was pronounced dead. The cause multiple stab wounds including a massive gash to her chest. Long after, the young detective arrived, logan stonehouse. A year under his belt as an investigator. But this would be his first big homicide case as lead detective. And lo and behold i didnt know what i was of talking into until i you saw a picture on the wall and realized whose house i was in. Reporter you knew these people . I did. I went to high school with the second oldest son, jacob. Reporter here he found himself looking at the bloody body of jacobs mother, karen. The lady everybody loved who brought cookies to all the games at school. Who could have done this . Detective stonehouse had been on the force long enough to be aware that Violent Crime of up here. Some said significantly. Ever since californias overcrowded prisons nearby were forced to reduce populations and to had reduce potentially dangerous offender likes like drug addicts, possibly desperate for money like a fix. So was this a Home Invasion robbery gone wrong . The detective took a look around the house. He and fellow officers fanned out around the neighborhood. There were footprints outside the property right . There was. There was a wood fence that surround that piece of the propertiment and property. And theres a back gate and trail that led to a canal area. Reporter the first patrolman told them he had seen a car speeding away as he raced toward the duenas house. Neighbors reported seeing two stranger nearby that evening. And here in this crime scene voep taken the next day, a screen on the window in karens bedroom that looked suspiciously like it had been cut open. Had intrudersen er it entered here . Was anything disturbed . No. The bedroom was intact. There wasnt drawers open like someone had burglarized the place. Reporter it didnt look like burglars had gone that way. Detectives had questions for the only man known to have been in the house all evening the husband, of course mark duenas. What was his story of what happened . He told us that he had been up with karen. They were watching a movie. And then once karen went to bed he tried to stay up longer to watch a giants game. He was falling asleep during it and decided to go to sleep himself. Reporter mark, in his room, karen already down the hall, he said in hers. The detective took mark to the Major Crimes Unit where mark whod been awake more than 24 hours by now, finished the story himself. I arkssleep, i hear crazy noise. You know you hear a cat sound like it wasnt cats. It was a weird scream talking . No. I just heard some weird screaming type stuff. What did you do . I ran i got up because i didnt want those whatever of going on to wake up my wife. Im sensitive like that. And i went to the door by the kitchen, opened it up and looked out there. I didnt see any cats. Shut it. Walked down the hallway, looked under, the lice were onghts were on. I figured shes up. Thats when i found her. Reporter the doctors questioned him, had his change so they could keep his shorts and tshirt for testing and sent him home. I remember him coming in the door and collapsing. Falling on the floor. We were really worried about him because he kept saying his heart so we thought maybe he was having a heart attack. He was he was ofa mess. Reporter as the family planned a funeral, their big sentenced family including karens brother joe and wife jackie descended on cottonwood. Ive never seen a person more broken. Reporter what was your perception of how he took it . Hes take ten incredibly hard. Still does. Reporter along with grief came anxiety. I lived next door. Im worried for my family. Im putting alarms on every door because somebodys out there. Reporter but the police did not seem to think that. In fact, within a day or two, one of the doctors announced no need to worry about some unknown killer stalking the town. Now why would he say that . Coming up, investigators were about to hear a strange tale from none other than karens husband. Sca reporter they measured time in units of pain in little cottonwood, california will during the surreal minutes and hours and days after karen duenas was murdered. The best way i can explain my mom is she was of pure of heart is the best way to do to say it. Reporter the whole big family karens family as well as marks, parents, brothers sisters, gathered to support each other and mourn and struggle with the question that hung in the air who did this. But the word on the street was there was of no there was no question at all. We immediately heard outlandish rumors. Youre going, i dont know where theyre getting this. Reporter the boys heard them, too. Rumors the detectives knew the killer was mark to which the family said ridiculous. I know theres no way possible he could have done it. My parents were best friends from as long as i could remember. Reporter but it that was true then why would detectives be so suspicious of a man married to his High School Sweetheart for almost 33 years . A man without so much as a track ticket on his record let alone a violent act . Its true that when wives are murdered husbands are frequently implicated, and mark did discover the body. But there was another reason. Just minutes after mark sat down to talk to those detectives he volunteered information that sounded to them like a motive for murder. What was of going on in our life, and it scares me when i think about it reporter it was an odd little story. One day at work toward the end of 2010, said morkark, a u. P. S. Coworker asked if he had ever gone on facebook. No said mark he happen. Well asked the colleague, havent you ever wondered what happened to people you used to know . Facebook might tell you. Mark thought about it and said well there was this girl he used to talk to back in high school wasnt a real girlfriend or anything. But he was curious about whatever happened to her. Sure enough the colleague found the woman on facebook. And pretty soon she and mark were texting and talking on the phone, catching up. We talked visited. Kind of got carried away with a little texting here and there. Reporter carried away . Well, that may be a little strong in this age of sexting and lurid electronic damn an dalliances. They did talk and text for several months, even said i love you a time or two. But was it some kind of affair . Well judge for yourself. Was of there ever any pictures sent or anything like that or of it just theres pictures of just maybe me or her, you know little innocent were not into any of that nasty porn. None of that. Just what do you look like now. She had accept a picture of her, its your turn. She does quilts she took a picture of her quilt. Showed a picture to me. Stuff innocent stuff. She had a public of her and her a picture of her and her grandkid. Stuff like that. Reporter and not once did they try to see each other. In fact when an opportunity came up they decided no it wouldnt be fair to their respective you spouses of more than three decade our their kids or grandkids, so they didnt. But as mark told the detectives, karen out what hed been doing when she went through a phone bill and had hurt her feelings. He promised to stop. Except he didnt. Mark bought a secret phone to continue that communication that karen wasnt aware of. Reporter it was the woman who put a stop to it. She said karen this letter postmarked just a little less than three months before the murder asking for forgiveness, promising it would never happen again. Karen told a couple her kids about it all. She was pretty upset for a while. How important was of that . I would definitely say everything together showed that karen of not happy in their relationship. Reporter mark told them otherwise, that it was a happy marriage the texting thing just a blip. But the detectives didnt believe it so they confronted mark. When did you find out that karen was going to leave you, mark . Leave me . Uhhuh. She was never going to leave me. Never going to leave me. Honestly. Reporter in fact investigators believe it backed up what they suspected from that very first night. Here, just hours after the murder weather they firsthen they first ayoucused mark of killing her. I didnt do it. Its crazy. Just like o. J. We need to be out finding the real killer right . Lapd they didnt have to go find the real killers. I know youre doing your job, but i would never lay a hand on i did not hurt her. I did not kill her. I walked in and found her in her condition. Reporter marks family by the way, said he told them all about that texting relationship. They said didnt seem like such a big deal. It sounds to me that it was you just them confiding in each other about their marriages and their families and just an outlet. Reporter her young ever son for youngest son, casey, it explained why there had been tension for his parents a few monthses before the murder. There was a good swap where they didnt get along, but it was a while before. Reporter they seemed to be back together again . They seemed better than ever. Reporter and those claims by investigators about a pending divorce . Not a chance said the boys. They never were going to give up. They taught us that. Im sure a little bit of trust was lost. Up, someone keeps something from you. You but it was something they worked on and they got over. Reporter all that grief infected summer, a cloud darkened over the duenas family. When casey graduated from high school in june i remember walking to where wed be seated and just seeing you know its my dad along with other family members. You know of course it was reporter five months went by that way, as if the early police suspicions had faded away. Of course, we know better, dont we . Coming up mark duenas is in for a bitter shock. He was upset. Like, are you kidding me . What his family did next would surprise everyone. Sort of thing hardly ever happens. Yeah. Like never. You are loved in so many different ways thats why youre wrapped in the comfort of pampers swaddlers with blanketlike softness and up to 12 hours of protection so all you feel is love. Wishing you love sleep and play. Pampers you clean with soap and water, about a thousand times a day. But germs might still be there. New lysol tap top will change the way you clean. It kills 99. 9 of germs without harshness, to help protect your family. Lysol tap top. Start healthing. Imagine if razors could move up and down, and all around. Hugging tight, swirling left and turning right. Behold, new venus swirl. The only razor with five contour blades and a flexiball. To contour to your tricky places, bones, bends and all. Smooth and steady, going this way and that. Bumps and grooves, curvy and flat. For skin as flawless as flawless can be. New venus swirl, try it and see. Ive just arrived in atlanta and i cant wait to start telling people how switching to geico could save them hundreds of dollars on Car Insurance. But first, my luggage. Ahh, there it is. Uh, excuse me sir . I think youve got the wrong bag. Sorry, they all look alike, you know . No worries. Well, cars here, i cant save people money chatting at the baggage claim all day. Geico®. Fifteen minutes could save you fifteen percent or more on Car Insurance. Theres only two of us. How much dirt can we manufacture . Very little. More than you think. doorbell whats that . Whats this . Swiffer sweeper. I came in under the assumption that it was clean. Ive been living in a fools paradise returning to our story, karen duenas, a mom to five boys, has been murdered. Her husband mark has done something unusual. He volunteered to police that months earlier he was carrying on a relationship by phone and by text with a woman who was once his teenage crush. Mark insists it was innocent certainly not a motive to kill his wife. His sons believe him. But what about detectives . Again, keith morrison. Reporter it was evening in cottonwood, california. October 5th 2012. Five months to the day after the murder of karen duenas. Her widower mark and son, casey, were watching tv. There was of a knock at the door. And when mark saw the detectives he was upset. Couldnt believe it. Like, are you kidding me . Reporter they were not. Detectives had suspected mark all along, and now they had a warrant for his arrest. Mark duenas was charged with firstdegree murder held on a Million Dollars bail to await trial. To see him in that situation is surreal. You hope the system works because theres an innocent man up there having to go through this. Reporter the whole extended clan including karens family told anybody who would listen that the police made a huge mistake. Ive never heard him call anybody a name. He just isnt that type of guy. I cant think of one time where he raised his voice to anybody. Reporter the Family Support what was persuaded an attorney 600 miles away in Southern California to take the case. Ron powell was his name. At first im not thinking i want to go up there. When i heard her family saying can you help us, and us metropolitan mark, i thought you know the victims family. The accused represented by you because they believe hes independent . Correct. Thats a once in a while thing, sort of never happens. Yeah never. Reporter but 14 months after the murder when mark went on trial, the family his, karens, and theirs filled the galleries every day to support him. You were there because you know that person. Reporter the judge allowed camera in court but no audio. So he cant play you the testimony of that woman from idaho and decided to conceal her identity. Thats the one he texted and phoned and hadnt seen in more than three decades. Will still, was to be with her, said the state, that mark killed his wife. On the stand at one point she said mark had mentioned that if they were meant to be together something bad would have to happen. Reporter the woman didnt seem to know what mark meant by that. But the prosecution claimed he meant hed have to kill karen. Not just so he could be with the idaho woman but so that he wouldnt have to share his pension with karen. His wife of 33 years. Anyway, said the state, karen must have angry at mark and might have told him that night she intended to leave him, she wanted a divorce. The facts of the case showed that something happened that night between mark and karen. Whether that be her discussing divorce or whatever the case may be, and he became upset and and murdered karen. Reporter the prosecution based that theory around a story told by some teenager two or three blocks away who said they heard a scream between 10 00 and 11 00 p. M. The pathologist testified karen could have been killed as early as 10 30 or as late as 2 30 a. M. But the state said it must have 10 30 after which mark must have washed his closings slashed the screen to make it look like an intruder came in then went to bed and wadeited for son, casey, to come home from the movie. One of the theories we did have is that he wanted casey to fine karen. Reporter hes sleeping peacefully is that the idea . Correct. Reporter then covered his tracks . Correct. Reporter except, of course casey didnt discover the body. So said the state, about 1 00 a. M. , mark had to make the 911 call him. When detectives listened to the call, they heard what sounded to them like an incriminating mistake. 911. Your emergency . Ive got my wife blood ever deswhere. Reporter what did he say . I killed my wife, the state claims. Then a sound they say is a wellknown barnyard explosiveetive ive got the to i killed my wife blood everywhere. Reporter an unintended confession caught on tape or so said the prosecution. He got it all together and all planned and then blew it on the 911 call . I believe so. Im sure if you just killed your wife, youd be pretty stressed on the inside which would make thing come out that you didnt mean come out. Reporter to the defense, it was quite simply bunk. Ive listened to it i dont know 100 times now. I dont hear that. Reporter defense attorney ron powell told the jury mark found his wife just after someone attacked her and told 911 this 911. Your emergency . Ive got the a my wife reporter a found my wiv. My wife. And the soup the state says was an explosive was what the defense said was sick. Listen again. I found my wife sick and blood everywhere. Do you think if they heard it that clear that this guy says i killed my wife, and hes the only one home, you dont think theyre arresting this guy . If that happened what are they waiting for . They didnt arrest him until four months layerment. Reporter meanwhile, police failed to follow up on plenty of evidence that in a town plagued by drugrelated crime, intruders intent on theft could certainly have been surprised by karen, then killed her, then fled. There was an unidentified car parked nearby time of the murder. Another car seen speeding from the neighborhood as the cops raced to the duenas house. The two strangers seen in the neighborhood and a trail of footprints leading away from the duenas back yard. And as for those screams heard by teenagers a couple of blocks away the entire block where mark lives hears nothing. The woman next door sleeps with her window open hears nothing. The person on the other side of the house is jason duenas who has his window open. He hears nothing. Reporter the defense put on a witness who said karen told her the week of the murder that she and mark were making plan for a Bright Future together. The idea that mark would kill karen so he could pursue a happily married woman from idaho he hadnt seen in more than 30 years was simply ridiculous said the defense. It sounds like a great motive when you look at it from a distance. When you get to it it sounds like puppy love. Reporter the defense rested its case in a matter of hours. When it went to the jury, how did you feel about it . I was pretty confident. You could see in the jurys face that they werent buying this. Reporter and something odd happened. The day the jury wouldnt out, a female juror overslept. Rather than delay the case the judge replaced her with an alternate. And yes, on such tiny wheels fates turn. Coming up, jurors get the case and report impressed. I thought the Sheriffs Department did a terrible job. Reporter really . Terrible job . Terrible job. Well. Did you know auctioneers make bad Grocery Store clerks . Thatll be 23. 50. Now. 75, 23. 75, hold em. Hey now do i hear 23. 75 . 24 hey 24 dollar, 24 and a quarter, quarter now half, 24 and a half and. 75 25 now a quarter, hey 26 and a quarter, do you wanna pay now, you wanna do it, 25 and a quarter sold to the man in the khaki jacket geico. Fifteen minutes could save you fifteen percent or more on Car Insurance. Lipton fresh brewed ice tea is the naturally refreshing way to enjoy your meals. Its the flavour we all savour does any food a favor. You gotta be ah more ah tea teariffic lipton. Be more tea. And now try iced tea in a squeeze. Im jerry bell the second. And im jerry bell the third. Im like a big bear and hes my little cub. This little guy is nonstop. Hes always hanging out with his friends. Youve got to be prepared to sit at the edge of your seat and be ready to get up. Theres no deep couch sitting. Definitely not good for my back. This is the part i really dont like right here. doorbell whats that . A package its a swiffer wetjet. It almost feels like its moving itself. This is kind of fun. That comes from my floor . Eww this is deep couch sitting. [jerry bell iii] deep couch sitting you get used to stale odors in your mudroom. You think it smells fine, but your guests smell this. Febreze air effects works instantly to eliminate odors youve gone noseblind to. Smells like a field of awesome in here. So you and your guests can breathe happy. You wouldnt 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. Comp 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 the jury in the duenas murder case was a little unusual. Not just because of that lastminute switch of jurors but because several of them had spent careers dealing with the justice system. And they certainly knew what was at stake. This is something that we all had to take very serious. Reporter here are three members of the jury. This one is a retired chief probation officer and former cop. He was surprised by the case he said, and not in a good way. I thought the Sheriffs Department did a terrible job. Reporter really . Terrible job . Terrible job in their investigation. Reporter in fact the jurors we spoke to said that feeling was pervasive in the jury room. And the 911 call that prosecutors claimed was a confession the jury couldnt decide what he said. We listened to it many many many times times at least. Yeah. Reporter couldnt tell . No. Reporter they voted 102 for acquittal at one point. One juror in particular of ad mapt about his guilty of adamant about his guilty vote. Which one . The alternate who replaced the woman who had overslept. That juror said hes guilty, and hes going to have to prove that hes not guilty. And im not going to change my mind. Im going hang this jury. Reporter the judge declared a mistrial. What was of that like . It was of heartbreaking. We thought my dad would be home that day. Reporter afterwards mark and karens extended family publicly pleaded do not retry mark. Let the it go. You see these people . This is love. This is belief in this human being. This is not a question in our hearts. Please listen to us and know we love of this man. Reporter so was it over . Oh, no. Not even close. Instead, shasta countys d. A. Assigned a new prosecutor to the case stephanie bridgette. Something to know about ms. Bridgette, up to this moment she had never lost a case not one. Her secret preparation, she said. She is very thorough. By the time you finished reading through it in your preparation, what did you think . I didnt have any doubt that mark was the one that killed his wife. Reporter one big change at trial number two the very first words out of the prosecutors mouth were the states version of that 911 call i killed my wife. Blood everywhere. No jury she declared could doubt the content of that call. And prosecutors offered yet another possibly damning statement from mark himself during his first of three tape recorded interviews with detectives which again he willingly submitted to without the presence of an attorney. The only cut i saw. Reporter in his very first interview, claimed the state, mark slipped and made an admission while describing the wound he said he found on karens chest. Like the guy knew what he was doing or something. You because the way he cut her, thats the only cut i saw. And there was tons of blood. There was none there coming out when i whoever of did i dont reporter what was of that again . Listen carefully. There was none there coming out when i whoever did i dont reporter when i found her or when i did it . No way to know what he might have said. But the state claimed it amounted to another quasiconfession. The second prosecutor also presented evidence the first prosecutor chose not to use. It, for example, from a criminalist who examined the clothes mark wore that night and found capers blood, though not visible to the naked eye, all over. There was a big area on the front of his shirt that covered all the way down. There was of blood on the back of the shirt. There was blood all across the waistband, down the sides. Different spots throughout the shores. Even blood shorts. Even blood on inside of the boxer shorts. Reporter which you dont think he could have gotten there by touching with his hands . Like removing changing adjusting . Absolutely not. Not in all those locations. Reporter the prosecutor claimed mark must have washed off some but not all the blood after the stabbing. Had a shower in his clothes or something. And then she claimed shed found the murder weapon or what could be the murder weapon. A knife found in the wrong slot in the kitchen butcher block. There was no blood on it but its handle was bearing a substance identified as either animal fat or some kind of cleaner. What it tells us is that he had something in the home available to him that could have caused that murder. Reporter so means, motive opportunity for premeditated murder. But would a second set of jurors agree. Coming up, they would want evidence. But just how much was of reporter november, 2013. A chilly autumn wind played around the corners of that big courthouse in the middle of reading. Inside defense attorney ron powellet frommed that ed thatmed that powell fretted, and there were new wrinkles. The blood on marks clothes and the knife in the kitchen butcher block. Remember, this is a retrial now. They felt this time that they needed to show a possible of a knife. They never said this of the knife. They were just showing this knife could have done it. Reporter in fact said powell, the you new evidence of no more persuasive than the old. No blood or animal fat found on the knife and some sort of soap . How about somebody used a knife to you cut a steak and then washed it . Could you wipe all the dna off a knife you put in the good question. Ive learned after this trial that blood will never leave closings, but it will go right off a knife. Reporter a for the blood on marks closings of course it was blood, said the defense. He handled her body. And police didnt see the blood at first because his shirt was red, and his shorts were black. And then there was the new prosecutors insistence that karen of very unhappy in her marriage and wanted a divorce. Was it true . No theres nothing to support it. Theres no faxcts to support it. No evidence to support it. Reporter this was of the issue that went to the heart of the prosecutors case. And her contention that the state had developed a clear idea of just what happened the night karen was murdered. I believe that most likely karen confronted him with the information that she had about the affair he was having with the lady in idaho. She probably said that was it. She wasnt going to have it. She was going to get a divorce. Thats when he decided im going to get the knife. Im going to go do you have any idea beyond your own fevered imagination that thats what happened . You dont have a you clue well you know all evidence points to that. Yes, i do think reporter how does the evidence point to that . We have a person who has been in a relationship with a lady in another state let me stop you for a machine. First of all, you said affair. The now youre saying being in a relationship. He was doing what millions. Millions of americans have been doing since facebook came along. They happen seepn each other for 30 years. You cant really call that an affair can you . Heres the difference it becomes an affair and crosses the line when you dont tell your spouse about it. Reporter you believe he was obsessed with this bottom . I believe he wanted more out of that relationship than she did. Reporter was it pure fiction, or what was it . What else could it be . I know shes got a law degree. I never saw a psychology degree. Reporter for mark and karens sons the prosecutors psycho analysis of their mother amounted to an insult. The d. A. Said things about my mom that were untrue. Did they know my mom better than i know my mom . Better than any of us . They act like they do. Theres no evidence. Reporter what you do you say to people whose reaction is well, you know, of course theyre going to feel that way, this is his family. Theyve just lost their mother. They dont want to lose their father, too. Life is so much harder protecting my dad. We would be moved on. We would know what happened if we thought that was the truth. But we all know with our hearts thats not what happened. Reporter the jury in the first trial had been hopelessly deadlocked, came so close to acquitting mark and sending him home to his family. The second jury was back in less than a day, and their verdict was written on family faces in the gallerys first row. I still hear the sounds of the boys right behind mark crying. I still hear that. Very tough. Reporter guilty of firstdegree murder. Sick. I felt like throwing up to be honest. I was sick. I feel bad for the family members because the family members theyre not going to be happy with the verdict. But in at the end of the day, its karen who was killed and karen who that verdict was of for. Reporter what would you say to them . This big extended family out there that doesnt think it got justice at all. I would sell temperature that im i would telethem that im confidhaep the right person was convicted. Reporter mark name of sentenced to 25 years to life if prison. Hes filed an appeal. His family will go on believing what they may 4, 2012 unknown intruder probably drug adixdicts intent on theft, burst in killed her, and realizing what they had done ran without taking a thing. Jason and his growing family still live right next door to the home he grew up in, the place it happened. And casey, until just recently still went to bed every night across the hall from his mothers bedroom. I mean it was always cottonwood, small town. Nothing happen here. Then the worst you can imagine happened. Reporter casey and his brother, troy no longer play baseball for the local college. The days when they looked toward the bleachers where their parents always sat side by side are gone forever. Thats alall for now. Im lester holt. Thanks for joining us. This sunday one time middle east Success Story turns disastrous. U. S. Troops withdraw from yemen as the country descends into all out civil war. State of distrust. We have to evaluate what other options are available. Benjamin netanyahu pulls to the right to win the israeli election. Has he left the Peace Process in tatters and altered his countrys relationship with the u. S. Permanently . Plus climate catastrophe. Jerry brown the governor of drought stricken california on why there should no longer be a debate about climate. This has to be at the level of a crusade. Find out which 2016 contender he thinks is unfit for office. Such a level of ignorance. An end game is illinois the most corrupt state in the country . As aaron schock faces a federal investigation. Why so many politicians from that state ended up in jail