this woman, tina sandoval. but the question that gets set for the next two decades. where are you, tina? and then the searches begin. yeah. where are you? brad goldschmidt: yeah. and we searched, oh gosh, probably over 50 different locations. narrator: officially she was a missing person. had been for more than 20 years. but the authorities, like then detective brad goldschmidt, couldn't accept that she was a runaway looking for a fresh start. he'd spent more hours than he could count searching gravel pits and drain ponds for missing tina. so poor tina was just a small little woman, and there's a lot of colorado. i mean, just this one area here. did you think we're never going to get this? oh, i thought we would never get her. narrator: 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. she would have been so good for the world. narrator: and she had an unshakable theory about who made her sister disappear. evil. he's just evil. narrator: did you t

dennis murphy (voiceover): tina's family has been proactive, appealing to the state parole board every time sandoval has come up for a hearing, saying, don't release him, not this time, not ever. if tina was sitting here-- don't we wish she were-- what would you tell her about all those years? i'd just tell her i love her, and we tried our hardest, and we're going to keep trying. justice is not fully served yet, and we're going to keep pushing. she emulated everything that was good. she just yelled through the door, i love you. and that was the last time i talked to her. so i said, where's brooke. and he said, we can't find her. kate snow (voiceover): a college student vanishes. i had this chill go through my whole body. they asked us, well, do you have a crime scene? no, we don't, other than flip-flops in a parking lot. we had a community that was scared who's going to be the next victim. kate snow (voiceover): 1,000 miles away, another student in danger. she said he's got a knife. he's trying to kill me. there were guns, and there was a girl there, and there was blood. this is not the first time h