Whitney Houston Cause of Death Revealed — Cocaine Found in System

Whitney Houston had cocaine in her system when she died -- this according to the L.A. County Coroner.

The L.A. County Coroner has just released the singer's official cause of death -- accidental drowning ... but the report also notes heart disease and cocaine use were contributing factors to Whitney's demise. A source connected to the investigation tells us it is "very possible" Whitney had a heart attack that caused her to lose consciousness and drown. The heart attack may have been triggered by hardening of the arteries as a result of cocaine use. As we previously reported, Whitney was found dead in a bathtub at the Beverly Hilton hotel last month and several pills were found on the scene -- including Xanax, Ibuprofen, and Midol. Investigators found NO EVIDENCE of cocaine in the hotel room. Law enforcement sources have told us from the beginning they did not suspect foul play -- and believe her death was not a homicide. Her family however had doubts about Whitney's demise -- suggesting there may have been foul play.