November 5, 1957 - October 18, 1984: Age 26
Jon-Erik Hexum was an actor and model. His good looks branded him as a "hunk", much to his dismay: he wanted a more interesting career than the one that a sex-symbol reputation tends to yield.
In 1984 he was filming a show called Cover Up, where he played a leading role as a fashion model who was really an undercover CIA agent. His co-star Jennifer O'Neill chewed him out on-set at one point because he was constantly fiddling with guns, playing with them as though they were toys. She would know: she had accidentally shot herself in the abdomen two years earlier while checking if a gun were loaded.
After finishing a scene in which he fired a revolver with blank rounds, there was a long delay. Bored by the delay, as a lark, he put the gun to his temple and said "Let's see if I get myself with this one." He didn't know that the blanks used on film sets are actually dangerous at close range. The paper wadding that seals the gunpowder into the shell is fired out of the barrel at a velocity that can injure at close range. The wadding struck him in the temple with enough force that a piece of his skull was shattered and propelled into his brain. After five hours of surgery and six days on a respirator, he was pronounced brain dead.