As BTK killer continued his murder spree, he also raised his own family: Part 3

Kerri Rawson said her mother was three months pregnant with her when her father Dennis Rader, the BTK killer, murdered a young woman
5:59 | 02/02/19

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Transcript for As BTK killer continued his murder spree, he also raised his own family: Part 3
?????? The bodies of Joseph Otero, his wife Julie, his daughter Josephine and their son Joseph II were discovered in the east Wichita home. The victims had been bound, gagged and strangled with a cord. You have a quadruple homicide in -- in a family neighborhood in Wichita, Kansas, in the middle of America. That just doesn't happen. People in Wichita didn't know who it was. We didn't know what kind of person would do that. We just wanted him behind bars. I don't understand how somebody that could be so protective of his own children could murder other children. He had just an incredible ability to compartmentalize. Rader called it cubing. The way that cubing works is you have multiple sides to a cube. When he's on the face of it, those sides are all part of him. He's not aware of them. He doesn't see them. He only is able to look out from one face. He can switch it very fluidly to the next side of the cube if he needs to, whatever the situation calls for. He could leave a crime scene, come home, clean up, go to bed, get up and start another day. Even when he wasn't killing, he was still looking for the possibility. Killers like Dennis Rader they're called power control killers. They love the power, they love the control and they want the attention. What's a natural way to get attention without identifying yourself is to interact. Call the media. On October 22nd, 1974, don Granger, who was a columnist for "The Wichita eagle" received a phone call from somebody who's claiming to be btk. This guy tells him to look in the side city library. Tells him a very specific place. Go to the engineering section, in fact, tells him the shelf and the book to look for. The police go find the book and there is a letter that describes the Otero murders in detail. The police did pick up somebody, three guys, for the Otero murders. This was in the newspaper, and Rader was upset. He didn't want someone else to get credit for his murders. He's somebody who really seeks attention. And so when he's not getting and so when he's not getting it, it upsets him. Because his identity in life is committing these crimes. He wanted to show that he knew who killed the oteros. He had done it alone. He knew all the details. He proved that by writing the details out. He goes point for point. Where each one of the oteros were found in the house, what they were wearing. They knew it had to be him because nobody had that level of detail. So it's kind of like, I'm your guy, but you're not going to figure out who I am. In the letter, he suggests the moniker btk, which would stand for bind, torture, kill. It was his nom de plume. That's what he wanted to be called, because that's what he did. He said, I like to bind them, I like to torture them and I like to kill them. In July of 1975, Rader became a father for the first time. My brother's three years older than me. Suddenly he now has a real family. He and his wife are overjoyed to have a child. He was working for ADT, the security company. He got to be in people's homes. To my dad -- the person that and stalked people -- I would imagine that sort of gave him like -- that side of him, like, a thrill. Then he starts getting a little bit restless. From 1974 to 1977, he will kill three more women. A college student named Kathryn bright, a mother of three named Shirley Vian and a 25-year-old named Nancy fox. I was born in '78. My dad murdered a young woman when my mom was three months pregnant with me. That kind of stuff happens to somebody else, but not to someone in your family. My name is Beverly fox and Nancy and I were sisters. Nancy fox was a hardworking young lady, worked two jobs. She lived by herself in a duplex. What she wanted was to get married, to have kids and have a family. She loved kids. How did he find her? How did he pick her out? Why Nancy? Dennis Rader will describe that he saw and noticed Nancy fox when she was getting mail one day. This was what he called his perfect crime. This case -- Nancy's case went exactly how he planned it. Nobody else was in the house. She wasn't expecting anybody else. He was not going to get interrupted. This one worked out the way his fantasies happened in his head. The next day, Rader did something unusual. He found a phone booth and he called in the murder of Nancy fox. Dispatcher. Yes, you will find a homicide 843 south Pershing, Nancy fox. The caller said, I want to report a homicide. Police went to that address and found Nancy fox dead, bound and strangled on her bed. Yes, you will find a homicide 843 south Pershing, Nancy fox. Reporter: So when you heard this, did it sound like your father? You can hear that clipped way my father could talk. Reporter: That's -- I -- like, I -- that was another -- like, these things just start clicking. Oh, my god, it really is my

This transcript has been automatically generated and may not be 100% accurate.

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