HOLLYWOOD - Police investigating the death of actor Heath Ledger have found a rolled-up $20 bill in his apartment, suggesting the late actor was a hard-drug user.

The Brokeback Mountain star, 28, was found dead in the bedroom of his New York home on Tuesday afternoon.

The $20 bill will now be tested by scientists, although police said no drug residue was visible on it and refused to comment on speculation that the bill was used to snort cocaine.

An autopsy carried out on Wednesday failed to reveal how Ledger died, although police believe his death is drug-related as sleeping pills were found strewn around his apartment. No illegal drugs were found.

Officials will now have to wait for the results of a series of toxicology tests, which may hold further clues into what caused the 28-year-old's death. A spokesman for the medical examiner assigned to the case insists it may take up to 10 days to conclude their investigation.

Meanwhile, Ledger's body has been released to a New York funeral home.

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