California authorities are investigating tragic actor Corey Haim's alleged links to a prescription drug scam.

The state's Attorney General's office launched the investigation on Friday after finding an unauthorized prescription in Haim's name during a separate sting operation connected to a San Diego, California man.

According to reports, members of the drug ring operated by ordering official prescription drug stationery from authorized sources and then used stolen doctor identities to access illegal medication.

The pads were either sold to prescription drug users, or to people who would then fill the prescription and sell them on the underground market, according to the Attorney General's office.

News show Entertainment Tonight reports over 4,500 fraudulent prescriptions in Southern California have been linked to the drug scam.

Haim died from a suspected overdose in Los Angeles on Wednesday.

Corey Haim Photos