but the authorities, like then detective brad goldschmidt, couldn't accept that she was a runaway lookingsh start. he'd spend more hours than he could count searching gravel pit's and train -- for missing tina. >> so 14 was just a small little woman, and a lot of colorado? -- >> i thought we would never get her. he >> they couldn't prove it, but it was the consensus of law enforcement that the young nurse was the victim of foul play. her sister susan didn't disagree. >> it just wasn't fair. you know, she would've been so good for the world. >> and she had an unshakable theory about who made her sister disappear. >> evil. he's just evil. >> did you think, i now have hannibal lecter here? >> yes. this guy is by far the worst criminal i've ever investigated. and that's 21 years of gang investigations under my belt. i am certain he convicted a felony a day for the majority of his adult life. and he got away with it constantly. >> the problem with the missing teen investigation was this. how could prosecutors convince the jury she was murdered if you couldn't even prove beyond a reasonable dou