The missing key. Plus the stunning admission. I still love my dad today. Nightline will be right back. Nightline continues. Here now, deborah r on february 25th, 2005, when i found out my father was arrested, this place became not my home. And no one ever slept in my house again. He calls himself the btk strangler and promises to kill again. The brutal crime shocked wichita. The most unsolved killing spree in wichita history. Btk stood for bind, torture, kill. That was his mchb. O. Reporter three letters which can touch off memories for anyone who lived in wichita in the 1970s. He would see a woman walking, and he would say shes next. One minute had a loving father. Right. Reporter the next minute, hes a serial killer. I mean, come on, the child of a serial killer actually talking about it . Thats something you almost never hear. Kerry rawson was 26 years old on the day she learned her father was the cold blood killer known as btk, responsible for killing ten people and terrorizing wichita, kansas for decades. There was a knock on the door. He said he was the fbi. He says your dad has been arrested as btk, and im going. Wichita was a wonderful city back in the 1970s. Just a nice, midwestern city, where people could raise their family without any fear. Never in a million years did wichitans think that a serial killer would come from here. My mom and dad met in 1970. They got married nine months later in may of 71. Reporter while he appeared to be a happilymarried man, his monstrous life would appear. The home of his wife. He spotted her when he was driving my mom to work and stalked her family. Reporter he went to the house one day and cut the phone line, then killed both parents, along with their two youngest children. When the older children came back from school and discovered their parents. I ran down the hall, went in their bedroom and saw my mother on the bed, me father on the floor. My heart just got ripped out of my chest. My life changed instantly. 11yearold Josephine Otero will be bound with rope and is hanging just off the floor. Leaves his dna at the scene and leaves. Reporter police did peck up three men for the otero murders which angered raider. Killers like denis rader are called power control killers. They love the power, they love the control and they want the attention. Whats the natural way to get attention without identifying yourself is to interact, call the media. Reporter raider calling the local newspaper, claiming to be btk and directing them to proof. This guy tells them to look in the city library, tells them a specific place, tells them the shelf and book to look for. The police go find the book, and there is a letter that describes the otero murders in detail. In the letter, he suggests the moniker btk, which would stand for bind, tor tuture, kill. Reporter he became a father and led the life of a normal family man with a job at a security company. But. From 1974 to 1977 he will kill three more women, a College Student named kathryn brieght, mother of three named shirley and a 25yearold named nancy fox. He called in the murder of nancy fox. Yes, you a homicide. The caller said, reporting a homicide. Police went to that address and found nancy fox dead, bound and strangled on her bed. You will find a homicide. Reporter so, when you heard this, did it sound like your father . Can you hear that clip, the way my father could talk. Reporter how would you describe your childhood with your father . I pretty much had the american dream, the three bedroom ranch with the big back yard and the springer spaniel dog. And then when i was 4 he built a massive treehouse for my brother and i. It was extremely out of the characteristic of my father to be physical ly abusive. Reporter but his murderous intent never went away. April 27, its 1985, and marine hedge, who just happened to be his neighbor, about six doors down, becomes victim number eight. The body was nude and police say badly decomposed. A pair of knotted pantyhose were found lying in the ditch beside it. Over the next five years he kills two more women. Vickie in september 1986 and Dolores Davis. After he married Dolores Davis he went silent for a long time. Reporter life went on for the raider family, kerry going off to college and meeting her future husband. He just seemed like another regular wichita dad to me. And then in 2003 my dad walked me down the aisle at our wedding. Reporter in 2004, a local paper writes an article about the 30th anniversary of the first btk killings. And we include in there that nobody remembered him, which invoked his ire. This morning we have more information on the letter sent to the Wichita Eagle by the btk killer. Btk started sending packages with mementos from his crimes. Reporter one of those boxes contained a floppy disc. We got into the meta data, and it showed that it had been typed on by a computer at a church in park city. The name of the computer was register the to the name of 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 were 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 wont 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 werent more victims. He told us that we would discover what he termed his mother lode. There were journals and drawings. He had material that he collected from each of his victims. Clothing. Car keys. He had compartments everywhere, false bottoms in the closet. Stuff in the crawlspace, stuff in the treehouse he had made for his kids. Reporter one minute had a man in your life who you thought was a loving father. Right. Reporter the next minute hes a serial killer. Right. I had to learn to grieve the loss of somebody i loved very much that no one else loved anymore. Reporter up next, how kerry unwittingly played a part in her fathers capture. It felt like an invasion of my privacy. Reporter plus, how she found it in her heart to forgive her dad even after he admitted to the notorious murder spree. The kids were hollering and screaming. Oh oh oh ozempic® announcer people with type 2 diabetes are excited about the potential of onceweekly ozempic®. In a study with ozempic®, a majority of adults lowered their blood sugar anan it. Hed an a1c oh under 7 . announcer and you may lose weight. In the same oneyear study, adults lost on average up to 12 pounds. Oh up to 12 pounds . announcer a twoyear study showed that ozempic® does not increase the risk of major cardiovascular events like heart attack, stroke, or death. Oh no increased risk . announcer ozempic® should not be the first medicine for treating diabetes, or for people with type 1 diabetes or diabetic ketoacidosis. Do not share needles or pens. Dont reuse needles. 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We have learned that rader has been charged with ten counts now of first degree murder. Reporter the community in shock. Denis rader was a serial killer in plain sight. Denis rader is literally the leastlikely suspect. He is a pillar of the community. Hes the president of his Lutheran Church congregation, a compliance officer. He wore a badge. Reporter it was his daughter kerry who unwittingly provided the information for the arrest. You had no idea. I had no idea. They found out i had annual pap smears. They got a sample of my dna. Reporter in some ways, your dna sealed your dads fate. Yes, it did, but nobody told me this. It would have been nice if someone had asked me for my dna, i would have willingly given it. It felt like an invasion of my privacy. He didnt think they had kept the biological samples from the crimes that he had committed all these years. And they brought up the dna, and they could nail him. Its there. Reporter while he was in custody, the story of the btk killer became an international sensation. Everybody wanted to talk to denis. I wrote him a number of letters and included my phone number. On one saturday morning i get a call. And the operator says, will you accept a collect call from the detention facility. I had btk on the phone. I have a recorder going, if thats all right with you. Okay. C can you pinpoint when you knew there was a problem coming . I would say probably grade school. And what kind of problems were those . Oh, sexual things. He talked about the hunt. He told me he got a high from it. Finding the woman, and then killing her. That was what turned him on. Do you have any remorse over the killings . Remorse . Yeah. Yes, i do. Denis rader told me he felt sorry for the victims, although no one believes that. It was more like he was sorry he got captured. After i hung up the phone, i remember thinking, i just talked to a man who has no soul. Reporter fac ovehelming eviden of his ra plded guilty. The plea hearings are usually ten, 12 minutes, but this one turned into about an hour and a half. Reporter with the courtroom transfixed in horror, later, recalling the agonizing details of every murder. I had never strangled anyone before, so i really didnt know how much pressure to put on a person or how long it would take. I tied her up and put a bag over her head and strangled her here is this man standing up in court in what i imagine was his church suit, recounting the murders of his neighbors, one by one by one. He makes himself sound like hes mr. Good guy, you know, like he says, i got mr. Yoe t pillow before i strangled him. He had a cracked rib from an accident, so i had him put a pillow down for his head. Reporter i was kind to him before i killed him. Thats where that massive disconnect comes in, and you realize, my god, my fathers a psychopath. Reporter later at the sentencing, he was confronted by the victims family members. I have wondered what it would be like to confront the walking cesspool that took my mothers life. Reporter then he was allowed to address the court. Thanks. I cant believe the people. Theyve done a lot of work. I hope i pronounce these peoples last names right. All the families walked out. They all got up, turned around and walked out the door. Hes thanking everybody like the police, and then he basically said like my family were pawns in his game and social contacts. Reporter the judge condemning rader to ten life sentences, the harshest punishment at that time. Do you think your mom had any clue he was doing anything criminal . No, mom and i both said if we had had an inkling that my father had harmed anyone, let alone murdered anyone, let alone ten, we would have gone screaming out that door to the police station. We looked like a normal american family, because we were a normal family. Reporter your book is called a serial killers daughter. Is that how you see yourself . Its taken me a long time to even be able to say that out loud, but thats the truth. Reporter kerry has now been able to forgive her father and is in touch with him. You will always be my baby girl. Hopefully your heart will mend. The dark side took me away. Reporter how could you even correspond with him . I mean, people would wonder, why wouldnt you just cut him off . I wasnt corresponding with btk. Im never corresponding with btk. Im talking to my father. Im talking to the man that i lived with and loved for 26 years. I still love my dad today. Reporter you still love him today . Because i love the man that i knew, that i lived my whole life with, thats the man i love. Our Cancer Patients re r like job. When he was diagnosed with cancer, his team at ctca created a Personalized Care plan to treat his cancer and side effects. So job could continue to work and stay strong for his family. This is how we inspire hope. This is how we heal. We love you, daddy. Good night. I love you guys. Cancer Treatment Centers of america. Appointments available now. Cancer Treatment Centers of america. There was no hesitation, i went straight to ctca. After my mastectomy, it was maddening because i felt part of my identity was being taken away. When youre able to restore what cancers taken away, you see that transformation firsthand knowing that she had options that she could choose, helped restore hope. My team made me feel like a whole person again. Cancer Treatment Centers of america. Appointments available now. Cancer Treatment Centers of america. You discover paint bleed you under your tape. Not with frogtape frogtape is the only painters tape treated with patented paintblock technology. Paintblock reacts with the water in latex paint to form a microbarrier against paint bleed, giving you the sharpest lines possible. Get professional results with frogtape. No messy lines, no paint bleed. For sharp lines every time, frog it has been excellent. They really appreciate the military family and it really shows. With all that usaa offers why go with anybody else . We know their rates are good, we know that theyre always going to take care of us. It was an instant savings and i should have changed a long time ago. It was funny because when we would call another insurance company, hey would say oh we cant beat usaa were the webber family. Were the tenneys were the hayles, and were usaa members for life. Get your usaa Auto Insurance quote today. After the story first aired on abc, kerry gave us a statement, saying she had received a letter from her father in february, in which he said hed watched a lot of interviews shed done for her book. She says she is not currently in contact with him and that she has been in an extended period trying to recover in that she was in an ongoing period of trying to rest and get peace and space. She added our family has moved, embracing a new start for all of us. Thats nightline. You can always catch our full episodes on hulu. Thanks for the company, america. Have a good weekend