of heather elvis on the phone. were only trying them for kidnapping and not murder. >> let me ask you this. after seeing that picture of heather back in 2014, do you expect this family to ever hear from her again? >> no. >> donald demarino, frankly, didn't have to testify. he didn't have to tell anybody what he saw. tammy moorer was his cousin, and the last thing he wanted to do was go against family. >> still, it was damaging testimony despite the fact that he couldn't produce the photograph. the question is, would anybody believe him? and the defense team was going to make sure the jury knew about his criminal past. >> what have you been convicted of in the past of? >> i got a burglary charge and a couple drug charges. >> what drug is it? heroin? >> yes, sir. >> donald demarino is a lot of things. he's an addict. you can call him a thief if you want to. one thing he's not is a liar. >> prosecutors confirmed there were no deals cut with demarino for his testimony. and it's impossible to know whether the jury belie

heather elvis. it was news nationwide when she vanished. >> she had a new job. she was going on a first date. >> it was overwhelmingly horrible. >> where she at? >> police work the clues, her car abandoned. >> i was scared to death. >> a mysterious caller captured on camera. >> why would this person call from a payphone, in the middle of the night? >> then came the secret. >> she was married. >> rumors about her being pregnant. >> she truly did believe that she was gonna leave his wife. >> anger, betrayal, revenge. >> a bomb exploded. it was world war three. >> this crazy love triangle, create napping, potential murder. >> yes. >> this is heather's life or talking about. >> terrifying. when you see your parents hurting, you wish that you could take all their pain away. and with something like this, it's impossible. ♪ ♪ ♪ >> hello and welcome to dateline. heather elvis was charging headlong into her future. an independent young woman eager to make her mark on the world. then one night, she disappeare

. >> her name is heather elvis. it was news nationwide when she vanished. >> she had a new job.. >> it was overwhelmingly