landwehr. hello, mr. rader, landry says you know why you're here.he says, i have a pretty good idea. >> we had staged the interview with dennis rader far in advance of him being in that room. we had a camera and obviously audio and video recording going on literally in three hours and 15 minutes. >> it got to a point where ken was finally talking to him about dna and where we could get dna from. >> i know that btk is the father of your children. i'm your children. i know that no doubt it's a done deal. the tests were done. >> he basically said, well, you got me. and he still wouldn't say it. so i finally looked at him and said, come on, dennis, just tell us who you are. >> say who you are. why don't you just say randi kaye elena kagan we begin tonight with breaking news in the case. >> we have just learned that dennis rader has now been booked into the sedgwick county jail. >> rader has been charged with ten counts now of first degree murder. >> today is a very historic day for the wichita police department. btk is arrested once he was caught and th

lieutenant kenny landwehr was determined to get his man, and he did. many credit him as the reason rader was finally captured. a true hero. landwehr died in 2014 after a battle with cancer. donnie wahlberg, thanks for watching. good night and to me, clowning was a way of relaxation for me. >> you regressed into childhood. you were able to relax and you could be goofy if you wanted to and still you had the facade of your face being covered. >> welcome to very scary people. i'm donnie wahlberg. it was the mid 1970s. years before the phrase serial killer had even been coined. so no one in chicago could have imagined there was one living among them. and that's just how john wayne gacy wanted it. by day, he was a beloved community volunteer, a friendly neighbor, and a successful businessman. even a professional clown who made kids laugh. but by night, john wayne gacy became the stuff of nightmares. cruising the streets of chicago looking for prey. the things gacy did to his victims were unspeakable. what made this seemingly normal guy into such a depraved m