Dennis Rader also known as the BTK strangler/ killer. BTK stands for bind, torture, kill. Dennis was born on March ninth 1945, Pittsburg Kansas. He has three brothers the oldest of the four. He's a college dropout but joined the U.S Air Force. When he killed, he first stalked his victims before he killed them with his hands. Dennis´s second approach was a knife and a handgun. Also he went on a killing spree of 10 between 1974-1991. Mr.Rader worked for ADT a security company before strangling the Otero family on January 15,1974. Police say that Dennis left semen at the scene, he states that he derived sexually pleasure from killing. The Otero 15-year old son came home later, after the killings and discovering the bodies. Five months later