From TMZ.com:

Actor Chris Penn died accidentally from an enlarged heart and the effects of a mix of multiple medications, the county coroner’s office said Monday.

“There is absolutely no indication that this is anything but an accident,” chief coroner investigator Craig Harvey said.

Penn, 40, the younger brother of Sean Penn, was found dead in his Santa Monica condominium on Jan. 24, but the results of his autopsy and toxicology tests were not released until Monday.

The primary cause of death was “nonspecific cardiomyopathy,” an oversized heart, with the “effects of multiple medication intake,” according to a statement issued by the coroner’s office.

“We know he had several prescriptions, including promethazine with codeine, which featured predominantly in his death,” Harvey said.