Addenda to Thuper Ranger's excellent writeup:
John Wilkes Booth was cornered by the Union Soldiers in a Virginia at tobacco barn. Historians do not know if he was killed by the soldiers or if he committed suicide. John Wilkes Booth died on April 26, 1865.
Actually, a third theory has gained some popularity in recent years. There is evidence that Booth escaped the burning tobacco barn (set alight by the soldiers pursing him) and settled in Oklahoma, which at the time was part of the Wild West and an excellent place for a fugitive to hide indefinitely. A corpse with signs of old injuries corresponding well to Booth's medical history was found in, IIRC, Tulsa. However, the descendants of the Booth family refused permission for Booth's grave to be exhumed (this was several years ago) and so the question is still open.
Speaking of Booth's grave, he was buried (maybe) in his family plot in Greenmount Cemetery near the site of his brother Edwin Booth's grave. His grave is marked with a blank headstone.