Well fuck. Dave Arneson, one of the co-creators of D&D, is dead. James Maliszewski states it better than me.
(I can't claim to know either him or Gary Gygax, but by damn, I'm at least going to make a post about it.)
Edit: The rumors of Mr. Arneson's death are greatly exaggerated. Oops. I trust Maliszewski had reason to trust his sources, though.