back to being dennis rader.ehow i knew at 6 that her body had been found and that she had been murdered and she had been strangled. >> the body was nude and police say badly decomposed. a pair of knotted pantyhose were found lying in the ditch beside it. >> reporter: how did that affect you? >> it scared me. like, i started having night terrors around that time. i would wake up screaming, sitting up in bed. my mom was always the one that would come comfort. i would say, there's a bad man in my house. and she's like, no, there's no bad man in your house. >> over the next five years, he kills two more women. vicky wegerle in september 1986 and dolores davis. >> my mother was a loving person. and for that reason, had lots of friends and really no enemies. >> dolores' house has obvious signs of an intruder making entry into the back of the house. they'd used a cinderblock and threw it through a sliding glass door. >> she's, of course, going to be immediately up running out there. that's when she sees him, the monste

dennis ken den -- rader dubbed the b.t.k. strangerler.r talks about the serial killer she called dad. i have over 20 pages of notes from b.t.k. there is a lot to learn from this man about evil. dr. oz: breaking news on missing colorado mom kelsey berreth. oming up next. r. oz: season 10 starts now. i became a

dennis. >> reporter: investigators found the church president was denis rader. they also had an old dna sample from the first 1974 crime scene. >> overnight we called 200 police men. we had helicopters, resources. we had a tank. >> we pull him over, and before he can hardly get it in park we're yanking him out of the car. we put him down, and he looked at the detector who handcuffed him and said will you let my wife know i won't be home for lunch? i assume you know where i live. we got chills >> this man is the btk strangler. >> reporter: and you were still at that point convinced they had the wrong man? >> i think reality was starting to creep in, and i felt my stomach just twist, realizing it would be true. >> reporter: his confession recorded during police interrogation. >> it took a while for denis rader to start talk being, but once he did, he told police more than they bargained for. >> the belt that i used. >> he spoke for over 30 hours. and he showed no remorse, no regret. the only regret he showed during this was that there weren't more victims. he told