Corey Haim died of pulmonary congestion, the actor’s mother has told Access Hollywood.

"Judy Haim told Maria that she received an early courtesy call from the LA County Coroner’s Office who told her that an autopsy found her son had an enlarged heart and his lungs were filled with water," Access Hollywood says. "His cause of death was due to pulmonary congestion."

There's no confirmation yet on what medications were in Haim's body. The '80s teen idol died early Wednesday morning in Burbank, Calif., after suffering for a few days from flu-like symptoms.

A memorial fund has also been established for fans and friends wishing to donate to his memory:

Corey Haim Memorial Fund Set Up
PO Box 87655
298 John Street
Thornhill, Ontario l3t-7r4
Canada