The document provides background information on Dennis Rader, known as the BTK killer. It describes that he spent time in the air force and worked in security. Neighbors saw him as rude and arrogant. Rader committed his first murders of the Otero family and went on to kill 10 people total. He was sentenced to 175 years in prison for the murders and was arrested in 2005. The document also notes that Rader sought fame and left notes about his crimes, and that he described his urge to kill as a monster inside him.