Jean-Michel Basquiat, though some sources list his death as heroin overdose only.
Chris Farley, died of cocaine and morphine sulfate overdose.
Joey Stefano, died of cocaine, morphine, heroin and ketamine overdose.
George V of the United Kingdom, his death was hastened by Lord Dawson of Penn using a speedball of morphine and cocaine.
Woah, go back a minute. George V? ROCK 'N' ROLL, baby! Also, he was euthanised? I'm shocked by this but maybe at such stages this isn't frowned on in medical circles?