Confessed serial killer Dennis Rader, also known as the BTK Killer for his “bind, torture, kill” signature, says a “demon” within him drove him to kill 10 people in Wichita between 1974 and 1991. In a new Oxygen documentary called Snapped: Notorious BTK Serial Killer, Rader can be heard telling a local news reporter about the “high” of killing in a previously unheard interview given right after he confessed to the murders in 2005. “I personally think, and I know it's not very Christian, but I actually think it's a demon that's within me,” he told KAKE-TV reporter Larry Hatteberg. “At some point and time, it entered me when I was young. And it basically controlled me,” he said. Asked about his victims, Rader said, “I mean, I have a lot of feelings for them. I guess it's more of an achievement for this object in the hunt. Or sort of more of a high, I guess.” Rader, who managed to evade police for three decades, also previously admitted to having plans to kill an 11th victim, whom he said he planned to hang upside down in her home before he was caught. He was arrested in 2005 and is now serving 10 consecutive life sentences in a Kansas prison.