The SKX Murders were a series of murders committed by Leland Vanhorn, a.k.a Serial Killer X (SKX) before and during the events of Condemned: Criminal Origins. The most notable part of these murders was that SKX killed other serial killers, and did so using their methods. However, over the course the two games, SKX is forced to kill various others who get in his way or to further his plans, thus breaking his Modus Operandi.