Wild Bill’s Last Deal
Wild Bill Hickok was playing poker at Nuttal & Mann's Saloon in Deadwood, Dakota, Dakota Territory, on August 2, 1876 when Jack McCall shot him in the back of the head, killing him instantly. After a life of gambling, gunplay and notoriety, Wild Bill's tragic death mirrored his life. Hickok was holding two aces and two eights when he was shot. Those cards are now called a "dead man's hand".
McCall was eventually hanged for the shooting although he was initially acquitted in an unauthorized trial. His motive is unknown.