Accidental asphyxiation.

Suicide has been ruled out and the examiner, Dr. Michael Baden, hired by David Carradine’s family, is still trying to determine if this was a case of auto-erotic asphyxiation.

His family believes his cause of death was due to a gang associated with the martial arts underground. What this means is a group of people that do not like his relation or interests to the martial arts.

Could be possible, who knows.