One of the most influential figures in pop history whose four-decade career included the highest-selling album of all-time, “Thriller,” Jackson had been preparing for a concert comeback in London next month he had dubbed “the final curtain.”

News of the death triggered an outpouring of grief as shocked celebrities, foreign governments and devoted fans paid tribute to the troubled star who struggled to rebuild his career after a 2005 acquittal for child abuse.

Lieutenant Fred Corral, a spokesman for the Los Angeles County Coroner’s office, said an autopsy would likely be carried out on Friday and would not speculate on the exact cause of death.

Jackson’s brother Jermaine, the family’s official spokesman, later revealed physicians had battled for more than an hour to revive the star after his arrival at the UCLA Medical Center before he was pronounced dead.

“Our family requests that the media please respect our privacy during this tough time,” Jermaine Jackson said. “May Allah be with you, Michael, always.”

As the sun began to sink over Los Angeles, a coroner’s office helicopter bearing Jackson’s body took off from the UCLA Medical Center, where hundreds of media and fans had gathered throughout the day.

Meanwhile police motorcycle riders surrounded Jackson’s gated mansion as crowds of tourists and fans congregated.

Pop diva Madonna was among dozens of celebrities who struggled to cope. “I can’t stop crying over the sad news,” the singer said in a statement. “The world has lost one of the greats, but his music will live on forever!”

The star’s first wife Lisa Marie Presley, the daughter of Elvis Presley, said his death had left her speechless.

“I am so very sad and confused with every emotion possible. I am heartbroken for his children, who I know were everything to him, and for his family,” Presley told MTV News in a statement.

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