Both Michael Jackson's family and his personal physician were at pains to explain on Sunday what caused the troubled pop star's sudden death weeks before his long-awaited comeback.

Dr. Conrad Murray, who was at Jackson's side when he died, told police he did not inject the singer with painkillers before his fatal cardiac arrest on Thursday, his lawyer said on Sunday after reports he received a shot of narcotic Demerol.

When asked at Sunday's BET Awards about the care his son received from doctors in his last moments, Jackson's father, Joe, said, "I have a lot of concerns. ... I can't get into that, but I don't like what happened."

He said funeral arrangements for the King of Pop were still being discussed. A family friend said services could take place on Wednesday and the body could be buried at Jackson's famous Neverland Ranch.

Tension over the mysterious death came to the surface at the BET Awards, modified at the last minute as a tribute to Jackson's musical genius. Some stars bristled over coverage of Jackson's downward spiral during the last decade, filled with accusations of child molestation and bizarre behaviour.

"He is one of our heroes," said rap artist and music impresario Sean "Diddy" Combs. "As African Americans, we are not going to let everybody beat him up."

Jackson, 50, was weeks away from an anticipated comeback with a series of 50 concerts in London. He rehearsed regularly up to the night before his death.

Concerns about his health had been rampant during his 2005 trial in California on charges of child sex abuse, of which he was acquitted. Last year, he was photographed in Las Vegas in a wheelchair.

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