planten was obviously a predator.tained information inside the apartment that led us to believe that he had looked into doing this, possibly, with other females. >> investigators are certain that the forensic evidence would have gained a conviction. but the real satisfaction is knowing that the evidence led to his capture. >> after we found out who planten was and did the search of his house, we did find some information on somebody he was probably currently watching for some time. it was very eerie to find that person and realize that you had maybe just saved her life by clearing this case. >> well, i know that forensic science played a huge role in this case. and, really, without the forensic science, without the ballistics, without re-creating this case, rebecca huismann's murder would have definitely gone cold and unsolved. i truly believe that. >> forensic science was phenomenal in this case. it was -- as one person put it, it is where old fashioned police work meets modern science. >>> up next, a predator terror