Toxicology results showed cocaine in her body, and coroner's officials said the results indicated chronic use.
In the bathroom, investigators found a small spoon described by investigators as having a "crystal-like substance" in it, and they discovered a white powdery substance in a drawer, a coroner's report released last week showed.
Houston had a history of drug abuse which marred her career, robbing her of her voice and reputation, but family and friends described her as intent on returning to glory in the months before her death.
Her death at age 48 sparked a renewed interest in her music and movies, sales of which will benefit her only daughter, Bobbi Kristina.
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