Report: At Least Five Doctors Under Investigation In Michael Jackson Death

Michael Jackson is set for a public memorial service open to thousands on Tuesday — but in the meantime, authorities continue to investigate the King of Pop's death on June 25.

According to the Los Angeles Times, authorities are investigating at least five doctors who prescribed drugs to the singer. A source told the paper that "numerous bottles" of Diprivan, a powerful anesthetic agent typically administered in hospitals, were found in the star's Holmby Hills home following his death. The drug's side effects include possible heart and breathing problems — Jackson was found unconscious and went into cardiac arrest before being declared dead, suggesting that the drug may have played a role in his untimely passing.

VIEW THE PHOTOS: Michael Jackson Death Investigation: Who's Who?

Results of toxicology tests done during Jackson's official autopsy are still several weeks away. A second, private autopsy has been reportedly done on the singer, but the results not disclosed.

Over 1.6 million fans have entered the lottery for tickets to Michael's public memorial at Staples Center in LA on Tuesday. An AEG spokesperson told NBC News on Sunday that 8,750 winning fans were be notified via e-mail by 6 PM PST on Sunday, contrary to reports that they wouldn't find out until Monday.

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However, according to the Times, fans will have to wait until Tuesday to see what the Jackson family has planned.

"This is a memorial, not a show, and there will be no information about who will be a part of it before the event," Ken Sushine, the Jacksons' rep, told the paper on Saturday.

A number of stars have already paid their respects to the King of Pop. Madonna honored him with a performance and a Jackson look-a-like on Saturday night at London's O2 Arena, where Jackson himself was set to perform later this month before the news of his death, and Beyonce sang a song at her Atlanta, Ga., tour stop on July 1 with lyrics about the late singer not fading away. Last weekend's BET Awards also saw such artists as Ne-Yo and Jamie Foxx paying tribute to Jackson.

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