NEW YORK -- An autopsy on Australian actor Heath Ledger was "inconclusive," a spokeswoman for New York City's medical examiner said Wednesday, adding that additional tests, will take more than a week to yield results.

"The autopsy is inconclusive," said office spokeswoman Ellen Borakove. "We have to do additional testing which will include toxicology and tissue testing. It will take about ten days."

Ledger, 28, was found dead in his apartment on Tuesday.