Doctors conducted an autopsy on the body of Michael Jackson on Friday but could not immediately determine what killed the "King of Pop," amid reports he had been injected with a narcotic painkiller shortly before collapsing.
Jackson was in full cardiac arrest when paramedics arrived at his rented mansion in the Holmby Hills neighborhood of Los Angeles on Thursday afternoon, with his personal physician trying desperately to revive him.

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The 50-year-old pop superstar was rushed to nearby UCLA Medical Center, where he was pronounced dead without regaining consciousness.
"The cause of death (determination) has been deferred, which means that the medical examiner has ordered additional testing such as toxicology and other studies," Los Angeles County Coroner's spokesman Craig Harvey said. "Those tests we anticipate will take an additional four to six weeks."
Speaking to a throng of reporters outside the coroner's office, Harvey said, "There was no indication of any external trauma or indication of foul play to the body of Mr. Jackson."
Police said they were seeking to question Jackson's personal physician, identified by news media as Houston-based cardiologist Dr. Conrad Murray.
Fans and fellow pop stars revived memories of Jackson's musical genius, tarnished over the past decade by accusations of child molestation and eccentric behavior.
U.S. President Barack Obama called Jackson a "spectacular performer" but said he believed aspects of his life were "sad and tragic," the White House said.
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Jackson's death was front-page news around the world as airwaves filled with his greatest hits from "Thriller" to "Billie Jean" and social networking sites were bombarded with messages and tributes.
"My heart, my mind are broken," actress Elizabeth Taylor, long a close friend of Jackson, said in a statement.
"He will be in my heart forever but it's not enough," Taylor said. "My life feels so empty. I don't think anyone knew how much we loved each other."
On Hollywood Boulevard, police put up barricades to control thousands of fans who filed past Jackson's star on the Walk of Fame to honor the child prodigy who became one of the top singers of all time with an estimated 750 million albums sold
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