Who murdered David Carradine?

If David Carradine was murdered, then who was the murderer? So far, the death of David Carradine is a possible suicide or asphyxiation or accident while doing the choking game. Autopsy is now being performed and hope that it will give the investigation justification of the suicide or otherwise, a new lead. Family of Carradine needs privacy now. They were shocked of what has happened to their loved one and it must be even more painfull to think that someone actually murdered David. If ever he was murdered, let us hope he or she would get caught- the one who murdered David Carradine.

By the way, I did not know that David Carradine is part of the casts of the movie Kill Bill, just learned it.