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that's your tattoo, isn't it? >> and three caught on camera clues. someone is in her car. someone is at her bank. but most jaw-dropping of all, someone is up on stage with a song turned sinister. >> i couldn't believe what i was hearing. insane. >> could karaoke be a key to this case? >> my heart was pounding and pounding. >> i was sweaty and nervous. we need to figure this out, fast. hello, and welcome to dateline. 29 year old carrie olson was the girl next door, bubbly and bright, with close friends and a new man in her life. she had everything ahead of her, and then she vanished. ...

In having more children, and that was a deal breaker for carrie. so they decide to go their separate ways. carrie soon start dating justin you'll, or an iraq war vet with a very different personality than the fun loving tim. >> he seemed very quiet and pleasant. he was polite, he was nice. he seemed a little awkward. >> despite his client an awkward demeanor, justin looked like a good fit for carrie. he was closer in age, hardworking, lawyer, and he seemed to find a place in her heart. so, they moved in together. it was a big step. for carrie, it was the first time she set up house with anyone...

Official explanation for how carrie died, the state presented something called, birkin, a method of suffocation designed to leave no marks, like sitting on someone's chest, and covering their nose and mouth. >> to support that scenario, the state called one of mcvay's ex girlfriends, katie smitty. >> why are you nervous? >> i'm scared of him. >> katie described an incident one night in 2013. she said she was startled awake by mcvay sitting on her chest. >> i couldn't breathe. he cut off my air. he is a big man. i'm not a very large woman. i couldn't inhale. >> you moved out after that? >> yes....

>> did you soar see this as, i can see this going to be a problem. >> i did, i saw this as a clash. >> then, just three weeks after justin movement, there was a problem. and it was a big one. carrie suddenly disappeared. it was a monday, december 30th, 2013, the start of a work week. carrie did not show up at the store, and did not call in. not like her at all. >> something was wrong. >> right. i called her, i could tell her phone was off. it was going straight to voice mail. and i thought about calling hospitals. i just was scared. >> not home, not at work, not in touch. where was carrie? com...

>> and why not? >> all i can say, and u.s. paper is a newspaper. i don't have any other comments about that. >> just interested in hastings? >> move on to our next question. >> finally, prosecutors called to the stand, carrie's boyfriend, justin mueller. he testified about the last time he saw carrie. >> did you say goodbye? >> i didn't really have a chance to say goodbye. just the way she left, i mean, i tried to base to say goodbye, yes. >> justin acknowledge that she was upset with him. >> the way she stormed out of the door, and i thought, maybe i upset her. in a minor way, because i wasn'...