This Day in History - Wild Bill Hickok

From HistoryChannel:

1876 'Wild Bill' Hickok is murdered

'Wild Bill' Hickok, one of the greatest gunfighters of the American West, is murdered in Deadwood, South Dakota.
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On this day in 1876, Hickok was playing cards with his back to the saloon door. At 4:15 in the afternoon, a young gunslinger named Jack McCall walked into the saloon, approached Hickok from behind, and shot him in the back of the head. Hickok died immediately. McCall tried to shoot others in the crowd, but amazingly, all of the remaining cartridges in his pistol were duds. McCall was later tried, convicted, and hanged.