Corey Haim's death is linked to an "illegal and massive prescription-drug ring," California Attorney General Jerry Brown said Friday.

Brown's office is investigating "an unauthorized prescription under the former child star's name that was found during an ongoing investigation of fraudulent prescription-drug pads ordered from a vendor in San Diego."

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The announcement comes even before the coroner has ruled on what killed Haim, the 1980s teen movie actor who struggled for decades with drug addiction.

Haim, 38, died early Wednesday after collapsing in the Los Angeles apartment he shared with his mother, authorities said.

Although Haim's heart was enlarged and he had fluid in his lungs, the coroner's chief investigator says a drug overdose has not been ruled out as the cause of the actor's death.

Haim got two powerful drugs from a pharmacy just 11 days before his death, according to a source with knowledge of the transaction.

His primary care doctor did not know about the prescriptions and called the pharmacy two days later to find out what Haim had been given, the source said.

His manager and a close friend both told CNN that Haim began seeing an addiction specialist just two weeks before his death.