The personal physician at Michael Jackson's side when he died told police he did not inject the singer with painkillers that friends say might be behind the King of Pop's death on the brink of a comeback bid.

A lawyer for Dr. Conrad Murray said yesterday that the cardiologist found Jackson, 50, unconscious in his rented mansion on Thursday and tried to revive him.

"The doctor was surprised when this happened. He didn't know why Jackson stopped breathing," said Edward Chernoff, the attorney who accompanied Murray during three hours of police questioning on Saturday.

Los Angeles police said after questioning Murray that they do not consider him a suspect, and law enforcement sources told the Los Angeles Times the meeting revealed "no red flag" of criminal activity.

As the case remains shrouded in mystery, the entertainment world geared up for its first big tribute to the pop star at the BET awards late yesterday. Top performers rushed to Los Angeles to appear at the show, modified at the last minute to honor Jackson.

The Jackson family holed up in their LA compound making plans for a funeral that could take place on Wednesday, possibly at the pop star's famous Neverland estate in California, family friend Stacy Brown said.

Brown said that a family source said Jackson had received an injection of the narcotic painkiller Demerol shortly before paramedics were called to the mansion. "They have been concerned about his addiction to medicines for years," said Brown, who co-wrote the book Michael Jackson: The Man Behind the Mask.

"It's been no family secret that they've been trying to get him help for his addiction" she said.

Chernoff said Murray "never prescribed nor administered Demerol to Michael Jackson," adding that Murray was paid by the concert promoter AEG Live in the lead-up to the singer's long-awaited comeback concert series.

The family ordered its own autopsy on Saturday after the Los Angeles coroner's office said it would need four to six more weeks to determine the exact cause of death.

Jesse Jackson, the (unrelated) civil rights leader who was with the Jackson family last week, told People magazine, "There is a concern about what happened the last 12 hours of Michael's life. The doctor has shown some bizarre behavior."

• Watch video which shows prison inmates dancing as a tribute to Michael Jackson