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messages saying that she which her job. >> she had something down in kansas. >> left behind a puzzling computer trail. >> emails, text messages, so active on social media. nobody can locator. >> she did not want to be found. >> exactly. >> a mom turned ghost. was she missing? or hiding? >> i wanted to know. taunts, threats, violence -- >> my leg is soaked with blood. oh, jesus. >> a deadly mystery that would lead three moms and one man. >> you were the last one to see her? >> it was as...

Depressions. >> she just would go under the covers and sleep, you know, she just hibernate. she would close herself off from everything. >> it is hard for a mother to watch her daughter go through that. >> yeah, it is. trying to get it out of her, you know, what can i do? and there is really nothing that i can do or say. >> but it got better, once cari was diagnosed with bipolar disorder, medication, even things out, and cari and max set it into an apparently happy and successful life. and then,...

Right back to liz golyar. meanwhile, detectives doty and avis busied themselves with good old fashioned earth-bound evidence. remember that one unidentified fingerprint found in a mint container in caris otherwise spotless s.u.v.? >> we asked our -- crime scene tech, "hey, can you compare that fingerprint to the known prints of liz. see what you come up with." >> reporter: it was a match. >> this lady who should have had very little interaction with cari should -- had no reason to ever be in her...

Remember, another part of their investigation involved this basic question. was cari farver alive or dead? >> her father died. >> reporter: yeah. >> and she didnt go to the funeral. missed her sons birthday. all these things. i mean, it didnt take ryan very long at all to come to a dead end where he -- he couldnt find anything to show that -- >> no. >> -- she was alive. >> reporter: suddenly cari farver looked not like a villain but like the real victim. and the woman who claimed she was the vic...

Cause of death from a medical examiner. what we have is their belief, their speculation, their notion that this is what happens, but thats -- that cant convict. >> reporter: and then the judge retired to think about it, and returned to an anxious courtroom. max, inside the courtroom, waited for the words. >> it -- it was nerve-racking. >> reporter: and then finally, an answer. >> the court finds, and it judges the defendant guilty, guilty of 1st degree murder for killing cari farver, and 2nd deg...

She just -- she had a brain on her. >> reporter: different than the women you had dated before? >> the majority of em, yeah. yeah, she -- well, for instance, what she did for a living -- programming. i considered myself a little bit of a computer nerd. but compared to her i didnt even know what a computer was. >> reporter: dave reconsidered ob his "no commitment" rule. a rule hed broken before with a woman named amy flora. they had two kids together. but it didnt last. >> after 12 years, you wou...

She is a whore. you shouldnt be with someone like that. i hope we can see each other soon, and then with a shudder dave realized, cari did see him. she seemed to be watching his every move. olt014 >> it was very common for me to get messages, e-mails or whatever that say, oh, i see you through your window. youre doing this, and id go, i am doing this. okay. great, and id haul ass outside, go looking for somebody cause somebody knows what im doing. >> reporter: even more disturbing, cari messaged...

Enough. liz golyar was arrested for murder. >> the best part of it was to be able to go to nancy and tell her, we arrested somebody for the murder of her daughter. >> reporter: that was a big day for her. >> thats what was making working this whole case worth it. >> what was it like driving out there to see her? >> it was a first for me, too. >> liz senate chile. >> they knew it would not be easy. >> it was very circumstantial. >> as a tiny weight was bearing down, a tiny business card yielded a...

>> all these pieces together made a big difference. >> reporter: all of it put together, said the prosecutors, told the story of how liz golyar murdered cari farver. they told the judge it happened the morning of november 13, 2012 after dave kroupa left for work. cari was on her laptop. >> we know by examination of cari farvers known facebook that she logged into her facebook at 6:39 a.m. that morning. about two minutes later she logged off. she was supposed to leave for work, but never made it....

Even kissed. and she turns to me, and she said, "look, if were gonna have sex, thats all it is. period. theres nothin more to it." >> reporter: huh. >> and asked me, "are you good with that? is that gonna be a problem?" and of course my eyes lit up. and im like, "bing, i hit the powerball." >> reporter: because dave felt exactly the same way. >> as a man i want companionship. so im always lookin for a girlfriend. but never a committed relationship. >> reporter: and you let them know that this is...