Louis Schlesinger PhD from the John Jay College of Criminal Justice discusses the nature and probable origins of the serial sexual killer. He gives an overview of the topic, and speaks of the early warning signs, the role of sexual fantasy and tension, of how often they are misdiagnosed as being psychotic, the impact of other co-morbid psychiatric influences, and of his recent study of the rituals and signatures that they may, or may not, leave with their victims, etc.