What did he die of...

He apparently died from auto-erotic asphyxiation.

http://abcnews.go.com/Entertainment/story?id=7763422

http://www.agcwebpages.com/BLINDITEMS/2020/SEPTEMBER.html

161. ENTERTAINMENT LAWYER 09/15 **12**

https://www.crazydaysandnights.net/2020/09/todays-blind-items-murdered-old.html

Murdered - Old Hollywood: This will be a hard one to solve. This actor was A list (David Carradine) for a very brief period when he starred in a network television show ("Kung Fu" (1972 TV series)) for several seasons. Other than that, there were more lows than highs. For a couple generations before his, the family (Carradine family) was in movies. Our actor's father's best friend was Old Hollywood Harvey (Eddie Mannix). That will come in handy later. Apparently our actor did some work for Old Hollywood Harvey which landed our actor his sole starring role (half-Chinese, half-caucasian Shaolin monk, Kwai Chang Caine) . That favor was supposed to be just roughing someone up, but it accidentally led to death. Old Hollywood Harvey covered it up and made sure the actor got the television role to keep him quiet. Well, apparently everyone in the family knew what happened. They also knew not to say anything when our actor was murdered (Death). No police were called. No cause of death released. Just a quiet funeral, sparsely attended. David Carradine/"Kung Fu"/Eddie Mannix/Kwai Chang Caine (Meet the sleazebag agent who inspired the new Coen Bros. movie) (David Carradine died of asphyxiation) (David Carradine Book Reveals Incest, Murder Suspicions) (BLIND ITEM REVEALED "Old Hollywood Harvey" 12/01/17)

He died of the Bruce Lee curse, since he starred in Kung Fu instead of Lee.

His daughter must have been humiliated. She's an actress.