The HLN Original Series "Unmasking A Killer" profiles the terrifying real-life story of the Golden State Killer, one of the nation’s most prolific uncaught serial killers. A man responsible for a staggering 50 rapes and 12 murders in California. Investigators have searched for the sadistic criminal for forty years and with recent evidence suggesting he may still be alive, in 2016 the FBI Sacramento announced a national campaign and $50,000 reward to identify the perpetrator – making the investigation hotter than ever.