http://news.yahoo.com/s/eonline/20090604/en_celeb_eo/127408 Cops in Thailand are currently investigating the cause of death, but they're treating it as an "accidental death" and a suicide.
David Carradine was one of kung fu cinema and TV's leading badasses. My main exposure to him was the second Kung Fu series and his performance as the eponymous magnificent bastard in Kill Bill.
Rest in peace, Kwai Chang Caine.