The person at Michael Jackson's home who called 911 on Thursday told the operator, the singer wasn't breathing and was unconscious, a recording of the phone call released on Friday has indicated.
"I need an ambulance," the person told the 911 operator.
Police spoke with Jackson's doctor on Thursday but have been unable to reach him Friday for further questioning, the Los Angeles Police Department said.
A car the doctor was using was towed from Jackson's home Thursday and impounded, authorities said.
The car may contain "medications pertinent to the investigation" into Jackson's death, said detective Agustin Villanueva of the Los Angeles Police Department.
The police did not release the doctor's name.
The doctor who was with Michael Jackson when he suffered a heart attack at his home in Los Angeles has returned to the city, say reports.
Public records show the car is registered to a Texas woman who is an associate of a cardiologist. The cardiologist is licensed in California and Texas and also has an office in Las Vegas, Nevada.
However, reports say, Michael's physian Dr Conrad Murray is preparing to speak to police investigating the star's death.
Officials were reportedly keen to interview the physician after Jackson's family suggested the singer died because of a drug overdose.
Reports say Jackson had been receiving a daily injection of Demerol, a synthetic narcotic similar to morphine, and may have been given "too much" on Thursday
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