Drugs in Chris Penn's System: Toxicologist
02/23/2006 AT 03:00 PM EST
The official cause of death will remain an enlarged heart, though the substances contributed, says the coroner.
Penn, the younger brother of Oscar winner Sean Penn, was found dead in his Santa Monica condo on Jan. 24.
Penn, who was said to have weighed 300 lbs. At the time of his death, died the same week that his latest film, The Darwin Awards, premiered at the Sundance Film Festival. His other credits included Reservoir Dogs, Starsky & Hutch and Mulholland Falls.