On another forum I'm on there's a thread about famous people dying on the same day as super-famous people (Sky Saxon from The Seeds -- that's "Pushin' Too Hard" on the Nuggets comp, for the less x-treme rock nerds among us -- died today too, getting eclipsed twice). So far mentioned:
Darby Crash/John Lennon: December 7, 1980
Prokofiev/Stalin: March 5, 1953
Aldous Huxley/JFK: November 22, 1963