The LA County coroner’s report lists cocaine among the drugs in Whitney Houston’s system when she died, according to TMZ.com. The coroner’s report also cites “accidental drowning” as the cause of death, which might have been precipitated by a heart attack.

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. Source

Whitney, 48, was found unresponsive in a bathtub in her hotel suite in Beverly Hills, CA on Feb. 11. Investigators found no cocaine in Whitney’s hotel room.

Whitney had a long history of drug abuse and alcohol problems dating back to the 1980s.