Listen to the 911 call here.

When the operator asks if there were any witnesses, the phone caller says that only the doctor was present with the victim.

Los Angeles police say they have towed the car of a doctor from Michael Jackson’s home because it could contain drugs or other evidence offering clues in the pop star’s death.

Los Angeles police spokeswoman Karen Rayner said coroner’s investigators want to interview the doctor but said she did not know the doctor’s identity. She stressed the doctor was not under criminal investigation.

“His car was impounded because it may contain medications or other evidence that may assist the coroner in determining the cause of death,” Rayner said.

Houston television station KHOU has identified Jackson’s personal doctor as Dr. Conrad Robert Murray, a cardiologist licensed to practice in Texas, who was living at the pop star’s mansion.

An autopsy has been performed by the Los Angeles County coroner, but it may be several weeks before all the results are in.

L.A. County Coroner Investigator Jerry McKibben said results of the autopsy would be announced if the cause of death can be determined, The Associated Press reports.

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