Bruce Lee.

The martial artist's sudden death on July 20, 1973, was not going to be easy to explain. Lee was, after all, so fit, so vital and so young—just 32. Any number of theories abounded, including marijuana-induced brain swelling. Following an inquest, coroner officials in Hong Kong settled on death by "misadventure," meaning accident and/or a possible bad reaction to headache medicine. The official story did not quell talk of everything from a conspiracy to a curse.