Whitney Houston Autopsy: Cocaine Found in System

 Kevin Mazur/WireImage.com

Whitney Houston's autopsy results have finally been released, and the singer's main cause of death has been ruled as an accidental drowning.

The legendary singer, who was found submerged under water inside a bathtub in her Beverly Hills hotel room February 11, also had traces of cocaine in her system and was suffering from effects of heart disease at the time of her death, according to an L.A. Coroner's report released Thursday.

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The report rules out foul play and trauma.

"She had heart disease and had used cocaine and wound up drowning," an insider at the L.A. County Coroner's office tells Us Weekly. "She was taking a bath and had heart attack where no one was there to come to her aid. It is not uncommon for anyone with arterial heart disease to have a history of using cocaine."

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The "I Will Always Love You" singer, who told Diane Sawyer in a 2002 Primetime interview that she had "at times" used marijuana, cocaine and pills to get high, had last been in an out-patient treatment program in May 2011, which she voluntarily entered into for drug and alcohol treatment.

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Houston, who was buried February 19 in a New Jersey cemetery next to her father John Russell Houston, was just 48 at the time of her death.

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