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camisole. it also came, police believe, from the killer. >> i, go we've got a bad guy and, we've got a bad guy we have to print. >> this has to be left by the -- >> absolutely. >> but whose blood was it? with a backlog at the vegas crime, lab dna test results were still months away. so, in that first days after theresa's body were found, detectives began looking at where they could learn from other evidence, like where her body was dumped and whether they were looking for a killer or killers. how many people committed this crime? >> i believe that, just from our investigation, it was a one person crime. what we found theresa -- makes that a little bit if he, if only because it was rough terrain. >> i believe it was more than one person. i think that, based upon where the body was found, 25 feet of rocks walking down that -- >> you would have to have some
insana disappeared, police found her body in a ravine. the autopsy showed she had been strangled. according to our unsolved case squad, theresa's killer or killers knew her well, and at the top of the list of people police wanted to talk to women who broke her heart. here, again, is josh mankiewicz we "lost in sin city". >> four days before theresa insana's body was found on that terrible monday morning in november, 2004, it was her coworkers from the rio, who first went to her home to check on teresa theresa. and then, when they can find, her alerted police. among, them theresa's lifelong friend and former roommate melissa match. >> i couldn't wrap my mind around whoever wanted to hurt her. what >> police ever asked if she was ever involved in anything illegal?
>> -- >> -- >> in fact, theresa's former fiancée was one of those coworkers who was first to enter the home that day. his name is jeff fenton, and he once lived in that house with theresa. but he also broke her heart just months earlier by breaking off their engagement right before the wedding. >> -- everything i can so that -- you guys -- >> when questioned by las vegas police, jeff fenton said he had played no part in theresa's murder. he said, he tried not to touch anything in the house or garage, but theresa's the car was still parked. >> i said, i don't -- the hole -- out -- really scared i was going to find something. >> police needed to know as much as possible about jeff, a man who seemed to be a bit of a mystery to most, i've been 30
A woman from a small town moves to the big city of Las Vegas, where she finds a new career and a new love, then she vanishes, and her body is found within a...
questioned about the murder. >> -- something that i had nothing to do with -- >> also questioned was fenton's new girlfriend, melissa ball. she was 23, and worked with jeff and theresa at the rio. >> -- scare you or anything, but your name has come up as -- a person that we need to talk to. >> first, melissa ball confirmed jeff's alibi, saying they were both at that core dealership the evening theresa was murdered. >> he was with me all day tuesday and tuesday night. he was with his little sister and me wednesday night. and there's no way in hell he would never hurt that woman. >> but melissa ball also admitted to police that she did not exactly favor jeff's decision just two weeks before the murder to sleep over at theresa's house to watch the
if theresa had been attacked, and the -- founder of the house supported that. on the stairs, a footprint, too large to be theresa's. and this -- >> we saw a small little brass or a metal ring. >> -- in a half bath, detectives found a towel rack missing from the wall, and two more spots of blood, one near the base forward, another on the mirror. >> analysis of those two blood droplets from the same person? >> same person. full male profile >> so, not theresa insana? >> not theresa insana. >> then there was that blood on the bumper of theresa's car. that would later turn out to be theresa's blood, not in assailants. detectives prepared themselves for what might be in the cars trunk. but when it was open, they found only a bit more blood and mud. then, inside the car, police found the driver's seat in an
and i think she -- there were some thought there that they're the maybe there was something going -- on >> and apparently, there was. shortly after jeff fenton broke up with theresa, he began dating that very woman whose name had been found on the collar i.d., another coworker at the rio named melissa paul ball. -- >> -- in the same office. >> it was in a -- situation for her. every day she had to go into work and see the man that broke her heart and then have to look at melissa. she always would say to me, i'm trying to be a better person and not allow it to bother me. >> and as the months passed, jeff and theresa where at least civil to one another. when we, can just two weeks before the murder, jeff agreed to take care of theresa's dog. and he slept over at her house when theresa had to work overnight at the hotel. and on the day police believe theresa was murdered, she did
because a month after her promotion, on october 27th, 2004, theresa insana failed to report for work at the rio. she was gone for a day. and then for another. so, coworkers, including her childhood friend melissa, went over to her house. inside, no theresa. just her dog. and turkey's. her cell phone, her purse and our car. and on the car's bumper, an unmistakable spot of blood >> i think at that point was when i became panic stricken and was like, something was wrong. something is definitely wrong. >> where was theresa? what had happened? and was she still alive? >> coming up -- the investigation begins. police find more blood in the bathroom. >> not theresa insana >> not
respond to "dateline"'s requests for comment. the one thing we know is that there is no prosecutable case right now against jeff or melissa. they had an alibi. and somebody else's dna is at the crime scene, and on the victim's body. >> there's not enough probable cause at this juncture. >> you have a very interesting case, with a lot of evidence that points certain ways, and then a giant missing piece. >> i completely by that there was some tension between melissa, jeff, and theresa. there's a big jump from that to murder. >> there are enough homicide cases, josh, that there is no real good reason for any of them. >> i think the mistake sometimes that people make is, when they try to look at motive as being always reasonable, always a, always clear. it is not. >> could this be a murder for hire? >> absolutely. >> -- >> it very well could be. >> -- this is somebody that either
>> detective -- retired in 2017. and the question of who killed theresa insana remains a mystery. when we sat down with her, and marie insana we still faithfully placing calls to investigators, refusing to let her daughter's murder be forgotten. >> how often have you talk to the police? >> about every couple of weeks. and i am a pain. and i am a nuisance. but i am a mother. i don't know if it's going to happen in my lifetime, or joes, but i believe it will happen. >> high school graduation -- >> theresa's friends too live for the day when an answer will come. and until then, they will remain as loyal to her memory as she always was to them. >> we know that it's not in our hands at this point. it's in god's hands to bring this person to justice, and that i will never give up and. i truly believe in my heart of