>> after btk disappeared in 1979, police would spend 25 more years in a frustrating search to try to capture him. did you ever look around? >> oh, always. >> btk, ron loewen knew, could be anyone, anywhere. listen to what the former wichita news director told us about the killer a year before btk was caught. >> i think this guy is probably a lot more normal than anybody thinks. he told us it was easy. after he killed someone, he just assumed his rightful place in the world. he's a person who has been walking in that community. he's really the stranger beside you. >> today, that all sounds positively prophetic. because that's just what dennis rader was doing all those years, hiding in plain sight, raising his children, going to church, getting a degree in his spare time. attending kansas state university home football games.