Here's an interesting piece from The Telegraph, highlighting all the conspiracy theories surrounding Michael's death:
Theory: Michael Jackson faked his own death to escape money worries and start a new life.Nutty, indeed.
For: Heavily in debt and under pressure from creditors to boost his finances with the gruelling 50-date London residency the King of Pop may have wanted to flee.
Against: The Los Angeles coroner’s office carried out a post mortem and expressed no doubts that the body was Jackson's
Theory: Michael Jackson was killed by Mahmoud Ahmadinejad to distract attention from Iran.
For: The King of Pop’s death was perfectly timed for the wobbling Iranian regime. Just as reports of its post-election clampdown were provoking howls of protest in the West, and pushing the previously hesitant President Obama to say he was “appalled and outraged", Jackson’s death sucked media attention from Persia to Bel Air. “Michael Jackson RIP” replaced "#iranelection” at the top of Twitter’s trending topics, effectively killing off the last hopes of a revolution.
Against: No evidence whatsoever.
Theory: Michael Jackson died two years earlier and was replaced by an impersonator when he announced his tour at a press conference.
For: Michael Jackson’s appearance at the O2 arena to promote his London dates was bizarre, even by his standards. Arriving 90 minutes late, he led the crowd in a brief chant of “This Is It” before leaving the stage with an unfamiliar walk. Conspiracy theorists claimed he looked too tall and his fingers were too stumpy.
Against: His entire family would have had to be in on the deception.
Theory: Michael Jackson crossed the border into Mexico and a double with a terminal illness died in his place.
For: Websites claimed a border patrol officer had seen Jackson crossing from California to Mexico shortly after his reported death
Against: There have been no sightings of him in Mexico in the last two years.
source: The Telegraph