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Police have questioned Michael Jackson's personal physician and have found there to be "no red flag" in his account of the events leading to the singer's death, a source told the Los Angeles Times.

The LAPD has stated that Dr. Conrad Murray — a Las Vegas cardiologist who was scheduled to accompany Jackson on his upcoming U.K. tour dates — sat with police for three hours Saturday night. Police have said that he is not suspected of any wrongdoing and is cooperating with their investigation. Murray's attorney, Edward Chernoff, issued at statement after the meeting, saying that his client "is in no way a suspect and remains a witness to this tragedy."

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A second autopsy has been performed at the request of Jackson's family, according to the L.A. Times, which could yield results much sooner than those of the L.A. coroner's office. (On Friday, the coroner deferred assigning an official cause of death until further testing could be completed, which could take four to six weeks.)

While most reports have indicated that Jackson went into cardiac arrest, the Associated Press is quoting a source who says that the cause of death appears to be a heart attack. The two conditions are not mutually exclusive, as a heart attack, the blocking of the arteries leading to the heart, can cause cardiac arrest, the cessation of the heartbeat.

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Neither condition rules out the possibility that drug use played a part in Jackson's death. The coroner's office confirmed that Jackson had been taking prescription drugs, but declined to identify them. Deepak Chopra told CNN on Thursday that he had refused to write Jackson a prescription for narcotics in 2005.

According to the New York Times, The Rev. Jesse Jackson said he had spoken to family members, who told him that Michael Jackson had been training for two to three hours a day "almost like a boxer" to prepare for the tour. He also revealed that the Jackson family was not acquainted with Murray.

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No funeral arrangements have been announced, though the L.A. Times reported that a memorial service will probably take place in the Los Angeles area.

Other updates:

-Robert Hilburn, a music critic for the Los Angeles Times, remembers first meeting Jackson when the pop legend was just a cute, wide-eyed 11-year-old, and was present for many of his triumphs, including his performance at Motown's 25th anniversary, the recording of "We Are the World" and his purchase of the Beatles' song catalog.

-TMZ obtained a series of photographs that show Jackson spending time with his family.

-The Jackson family released a statement to People.

-Rolling Stone's Rob Sheffield explores Jackson's many eccentricities, and how they fueled his singular repertoire.

-CNN spoke to Rev. Al Sharpton and others about Jackson's import within the African-American community as the first black teen star. The piece also explores the star's shifting physical appearance.