The Los Angeles County coroner’s finding that the death of Michael Jackson was a homicide could mean criminal charges for his doctor, who told investigators that he administered a mix of powerful drugs to treat the pop star’s insomnia hours before his death.

The finding makes it more likely criminal charges will be filed against the doctor who was with the pop star when he died. Dr. Conrad Murray, Jackson’s personal physician, is the target of a manslaughter probe headed by Los Angeles police.

The homicide ruling was based on forensic tests that found the anesthetic propofol combined with at least two sedatives to kill Jackson, a law enforcement official told the Associated Press on Monday, speaking on

condition of anonymity because the findings have not been publicly released.

A sleepless Michael Jackson spent his last hours pleading for a dose of a powerful anesthetic, his doctor told police, according to unsealed court records, the Los Angeles Times said. For six hours, Murray said he resisted — fearful that the pop star had developed a dangerous addiction to propofol. He finally relented and at 10:40 a.m. added the drug to Jackson’s intravenous drip, according to the records.

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