The document provides background information on Dennis Rader, known as the BTK killer. It describes that Rader spent time in the air force where he committed his first two murders. He later worked in security and was described as rude and arrogant. Rader admitted developing early fantasies of bondage and tying up girls. He committed his first family murders by killing Joseph and Julie Otero and their two children. In total, Rader committed 10 murders and was sentenced to 175 years in prison for his crimes when he was arrested in 2005.