Serial Killer Documentaries » Israel Keyes, was an American serial killer that raped, mutilated and murdered multiple victims in Alaska, Vermont. New York and Washington.. it is believed that he's responsible for at least 8 deaths but that number could be significantly higher.. on Dec, 2 2012, while being held in prison in Anchorage, Alaska, on suspicion of murdering 18-year-old Samantha Koenig, Keyes took his own life.