Two men attempted to assassinate President Harry S. Truman on November 1, 1950. Three White House police officers were wounded. Private Leslie Coffelt, who fired one shot -- one shot that hit one of the would-be assassins in the head and killed him instantly -- , died of his wounds. The assassin who stood trial and was convicted, Oscar Collazo, was sentenced to death. Truman commuted his sentence to life imprisonment a week before the scheduled execution. In 1979 President Jimmy Carter pardoned Collazo. He died in Puerto Rico 15 years later.