pop star Michael Jackson's final hours puzzle doctor

Pop star 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.
Jackson's father, Joe, said, "I have a lot of concerns. ... I can't get into that, but I don't like what happened."
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 behavior.

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.
Promoter AEG Live said Jackson had passed a four-hour medical exam earlier this year.
Murray -- a cardiologist hired ahead of the concerts and paid by AEG, according to his lawyer -- was surprised to find Jackson unconscious and not breathing in his rented chateau in an upscale Los Angeles neighborhood.
Los Angeles police said after questioning Murray that they do not consider him a suspect. Law enforcement sources told the Los Angeles Times the meeting revealed "no red flag" of criminal activity.