An "accident" during
autoerotic asphyxiation is an "interesting" cause of death. Apart from the
only hypothetical case of Michael Hutchence (INXS), Wikipedia mentions
Kevin Gilbert.
David Carradine doesn't count. He was only
acting :
EDIT: Ops! I've found an earlier case:
Frantisek Kotzwara (1730-1791). In fact, it's the first recorded case.