I've noticed, in my life and work, that people who go through life with hatred and delusion, people who never introspect and exorcise their bad behaviors, have a very high tendency to wind up with serious medical issues. These are also people that are more prone to engage in risky behaviors to distract from self-realization.
I'm betting he died of one of two things: Cardiac arrest compounded or caused by drug use or auto-erotic asphyxiation. I wouldn't rule out other causes though. We'll know when we know.