exhibit some kind of deviant sexual behavior in their teens or early 20s. randy lee allen appeared to be one of the few exceptions. >> i just found it incredibly strange, you know, all of a sudden one day he woke up and decided to commit such a horrific crime. when somebody decides to learn to dive into water, they don't usually jump off of a cliff first. they'll jump in off of a pool and to me this was jumping off of a cliff. there had to be more in his background. we just were unable to uncover anything. >> randy lee allen lived in the dallas-ft. worth area of texas at the time when a number of young girls were abducted. >> i feel like there's probably other victims. and that's our department's opinion. the investigators that worked on this case, the investigators that have read this case outside of our department, the prosecutor's office, all believe there are probably other victims out there. >> but none has been found.