In an urgent, but collected phone call to 911, an unidentified man describes Michael Jackson as lying on a bed unresponsive while a doctor kept "pumping him."
"I need an ambulance as soon as possible, sir," the man said on audio tapes that were released this afternoon in Los Angeles, where the singer died Thursday at age 50.
"We have, we have a gentleman here that needs help and he's not breathing yet… he's not breathing… we're trying to pump him but he's not breathing sir...."
The 911 operator confirmed Jackson's age and the address -- 100 Carrolwood Drive. "Where is he right now?"
"He's on the bed," said the caller.
"Let's get him on the floor and do CPR," said the operator, reassuring the caller as he gets more agitated. "We are on our way there."
"Did anybody see him?" asked the operator.
"I have a personal doctor here, but he's not responding to anything, CPR, or anything," the caller answered.
"We are on the way," said the operator. "If you have a doctor, he's a higher authority than me. Did anyone witnessed what happened?"
"No, just the doctor," the caller said. "He's the only one here."
The caller spoke to the doctor, and a muffled voice can be heard in the background.
"If you can please," said the caller.
"We are on our way," responds the operator.
"Thank you sir, he's pumped his chest and he's not responding to anything...please...thank you," said the caller before the call ends.
The Los Angeles Fire Department was called to Jackson's residence at 12:26 p.m. Pacific Time on Thursday. Paramedics performed CPR on Jackson, who was not breathing when they arrived at his home.
He was then rushed to UCLA Medical Center, just six miles from his home, where he was later pronounced dead after doctors there worked on him for an additional hour.
Jackson's autopsy began this morning. At a press conference, Los Angeles assistant chief coroner Lt. Ed Winter said he doesn't expect to discern Jackson's cause of death today.
"The cause of death is going to be deferred until we get the results of all the tests," Winter said. "The likelihood is very slim that we'll have any results to release today because of the extensive level of the tests we'll be performing."
He added that additional laboratory tests, including toxicology tests, are likely and those results may not be known for several weeks.
But according to a senior law enforcement official briefed on the initial investigation of Jackson's death, it's probable drugs played a part. He told ABC News that Jackson was "heavily addicted" to the powerful pain killer Oxycontin and received "daily doses" of it and of another pain killer, Demerol.
The Los Angeles police were told Jackson received an injection of Demerol one hour before his death, the official added.
The information and other emerging details make it almost certain the Los Angeles Police Homicide and Robbery Division will launch a full investigation into the circumstances of the pop singer's death. The squad was given the assignment initially because of the "high profile" nature of the case.