David Carradine died of asphyxiation but did not commit suicide, it has been confirmed.
Medical examiner Dr Michael Baden has concluded that the way in which Carradine's body was bound before his death confirmed that he had not intentionally killed himself.
"The cause of death was asphyxiation, an inability to breathe. Now why that happened is still what we're working on." Baden told Reuters.
"He didn't die of natural causes, and he didn't die of suicidal causes from the nature of the ligatures around the body, so that leaves some kind of accidental death."
He added that the full determination of the cause of the actor's death would not be known for at least another week.
It has been suggested that Carradine's death was caused by auto-erotic asphyxiation.