A Las Vegas double murder that stunned even the most hardened detectives. watch
NBC News investigates the infamous serial murder case that terrorized New York City in 1977. Did David Berkowitz - the confessed serial killer known as Son of Sam - have help in his crime spree? Here, in rare video, Berkowitz speaks for himself on camera - and makes startling charges involving Satanic cults and a descent into evil. watch
Serial killer Jeffrey Dahmer in a prison interview about the victims he murdered and cannibalized - and the urges that drove him. And in rare interviews with Dahmer's father and mother, Dateline NBC's Stone Phillips examines events in Dahmer's childhood that could have pushed him to murder. watch