Unmasking a killer Season 1

This is the terrifying true story of one of America's most prolific uncaught serial killers. He's responsible for a staggering 51 attacks and 12 murders ... that we know of. For forty years investigators have been on the manhunt for this sadistic criminal and recent evidence suggests he may still be alive. With the FBI offering a $50,000 reward, the investigation is hotter than...