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i'm andrea canning. and it sees "dateline". >> i just knew something horrible happened. >> she was a small town girl with big dreams. and they were all coming through in vegas. a career at a casino, and a fiancée -- then, she vanished. >> i remember going to church every day and saying -- >> days later, police did. murdered, blood on her collar, a struggle at her house, and clues from a camisole. what had happened? >> we can't arrest until it's solved. >> her friends will not quit. her parents will not stop. >> i am a pain. and i am a nuisance. but i am a mother. >> can "dateline"'s...

and it sees "dateline". >> i just knew something horrible happened. >> she was a small town girl with big dreams. and they were all coming through in vegas. a career at the casino, and a fiancée -- then, she vanished. >> i remember going to church every day and saying -- >> days later, police did. murder, blood on her collar, a struggle at her house, and clues from a camisole. what had happened? >> i can't arrest until it solved. >> her friends will not quit. her parents will not stop. >> i am a pain. and i am a nuisance. but i am a mother. >> can "dateline"'s own team of investigat...

Fenton's wife, melissa bell. when you get the dna results back, were you guys surprised? >> i don't think we were necessarily surprised. we thought it was a possibility that it would not be him. it kind of made his lean towards more and that melissa was calling the shots, and jeff might have found out after the fact. >> do you believe jeff fenton had something to do with this? >> i do. i do. >> that's not his blood at the scene. >> he knows something. and his new wife noticed something. we just need to find out that one person that they know or somebody else knows. >> maybe he is not involved....

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 re...

Dog while i theresa stayed at work. >> it upset me. because, in the relationship, she made him -- and that's what she was doing again. >> i think the fact that jeff came over and watched the dog and state and slept that theresa's house was definitely upsetting to melissa. >> and -- not there at the time? >> that's what she's told. >> you maybe think she maybe thought, theresa is there? >> -- jeff -- stay over at the house, here's the key. >> there's just still -- between jeff and theresa that we believe melissa didn't want. >> especially, thought to tech teams, a new girlfriend who, as melissa...