You know Jeffrey Dahmer, John Wayne Gacy and Ted Bundy but you've probably never heard of Israel Keyes, one of the more terrifying serial killers of all time. In the last decade, Keyes admitted to kidnapping, raping and murdering numerous victims across multiple states...and getting away with it. Until he went after one young woman, Samantha Koenig, in Anchorage, Alaska, who would ultimately be his undoing.