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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 didn't even know what a computer was. >> reporter: dave reconsidered ob his "no commitment" rule. a rule he'd broken before with a woman named amy flora. they had two kids together. but it didn't last. >> after 12 years, you would think there would be some kind of a proposal or something. but like i said, he's kind of -- [...

She is a whore. you shouldn't 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. you're doing this, and i'd go, i am doing this. okay. great, and i'd haul ass outside, go looking for somebody cause somebody knows what i'm doing. >> reporter: even more disturbing, cari messaged dave that she'd taken his extra apartment key, and had been coming, and going when he wasn't t...

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. >> that's 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 lot of emery. >> it was just b.s. luck, right? >> i don't think it was luck. i think it was divine

>> 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 farver's 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. >> she was intercepted. something happened. that something was the defendant. >> reporter: hard to...

Even kissed. and she turns to me, and she said, "look, if we're gonna have sex, that's all it is. period. there's 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 i'm like, "bing, i hit the powerball." >> reporter: because dave felt exactly the same way. >> as a man i want companionship. so i'm always lookin' for a girlfriend. but never a committed relationship. >> reporter: and you let them know that this is the way it's gotta be. >> that was the first conversation. yeah. take it or leave it, that's...