Fentanyl, a drug more potent than morphine, was found in her heart, blood and liver, according to a toxicology report released by the Los Angeles County Coroner's Office on Friday.
Harvey, 35, was found unresponsive 27 June in the bathtub of her Hollywood home and was pronounced dead at a hospital. Neither drowning nor foul play contributed to her death, according to the report.
British-born Harvey, daughter of actor Laurence Harvey, gave up a modeling career and socialite lifestyle to become a bounty hunter.
She was arrested in West Hollywood in May on drug charges and also faced federal charges of conspiring to distribute drugs, crossing state lines for unlawful activity and having property used in or obtained through criminal activity in Gulfport, Mississippi.
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