Cause of death: heart disease
Christopher Shannon Penn (October 10, 1965 – January 24, 2006) was an American actor. He was the brother of actor Sean Penn and musician Michael Penn. Noted as a skilled character actor, he was typically cast as a tough character, featured as a villain or a working-class thug, or in a comic role and had roles in such films as To Wong Foo Thanks for Everything, Julie Newmar, The Wild Life, Reservoir Dogs, The Funeral, Footloose, Rush Hour, Corky Romano, True Romance, Beethoven's 2nd, Short Cuts, The Boys Club, All the Right Moves, At Close Range, Pale Rider, and Starsky & Hutch. During his career Penn had won the Volpi Cup for Best Actor for his performance in The Funeral. He also provided the voice of corrupt cop Edward "Eddie" Pulaski in the video game Grand Theft Auto: San Andreas.
Penn was found dead in his apartment on January 24, 2006, at the age of 40. An autopsy revealed the primary cause for his death was "nonspecific cardiomyopathy" (heart disease).
Source : Wikipedia