Update: The autopsy did not yield a definite cause of death. The lab tests are negative on the rolled-up 20-dollar bill found nearby. Medical examiners have said that it will take at least ten days to complete toxicology reports.
Clearly, it is too early to make an exact determination as to cause of death. Paparazzi, people, and MSM press from all over the world are camped outside Ledger's apartment building. They watched and snapped as he was rolled out in a black plastic body bag on a stretcher before being loaded into a waiting emergency medical transport vehicle.