Uncovered by L.A. coroner: Whitney Houston's cause of death

The toxicology report shows:

The Los Angeles County coroner's office has determined that Whitney Houston's main cause of death is: "drowning and effects of atherosclerotic heart disease and cocaine use."
The singer was found in the bathtub of her Beverly Hilton Hotel room on Feb. 11, hours before a pre-Grammy party. She was 48.
The coroner's office also said the manner of death was an "accident."
However, the toxicology report adds that "Cocaine and metabolites were identified and were contributory to the death. Marijuana, Alprazolam (Xanax), Cyclobenzaprine (Flexeril) and Diphenhydramine (Benadryl) were identified but did not contribute to the death."
An autopsy was conducted the day after she died. Capt. John Kades of the Los Angeles County coroner's office said at the time there was no indications of foul play and no obvious signs of trauma on Houston's body. Prescription pill bottles were found in her room, but the number of pills were "not in alarming amounts," said officials.
Dionne Warwick said earlier this month she suspected her cousin died of a "heart attack."