Was Herbert William Mullin driven by nature or nurture?
Hollywood has always had a dark side, but Kenneth Bianchi and Angelo Buono were perhaps its darkest.
Serial killers usually work alone but Bianchi and Buono would defy all the rules. In the late seventies, these 'killing cousins' would commit a series of brazen murders that left the women of Los Angeles terrified to walk the streets.
Their murders plumbed the depths of depravity and their cold heartedness and forensic awareness left detectives angry and frustrated.
On his capture, Kenneth Bianchi would make an audacious attempt to convince the world he had multiple personalities and was not responsible for the murders.
Bianchi and Buono would kidnap, rape, torture and snuff out the lives of 12 innocent young girls, but what had led to this extraordinary collaboration in killing? Were they both born to kill?