Heath Ledger’s death is still under investigation

Heath Ledger’s death is still under investigation
A doctor in California and another in Texas are under investigation by federal drug authorities in the matter of Heath Ledger’s’s death.

The Australian actor, 28, was found dead in his downtown New York apartment on Jan. 22. An autopsy whose results were announced earlier this month blamed an accidental mixture of prescription drugs, said New York City’s Chief Medical Examiner.

“We are investigating doctors in Los Angeles and Texas with regard to Ledger’s prescriptions,” the source tells PEOPLE.

However, the source did not say whether any wrongdoing is involved, saying, “We don’t know yet. The agents were there this week, and we are waiting to hear from them.”

The doctors in question are thought to have supplied Ledger with Oxycontin and Vicodin, law enforcement sources tell New York’s Daily News.

At issue is whether or not the powerful painkiller were prescribed legally, says the newspaper.