Published: 3:03PM BST 26 Aug 2009
The shaky 29-second clip will be seized upon by conspiracy theorists who believe that the King of Pop is still alive, although there is no evidence to suggest that it is genuine.
In the footage, which appears to have been filmed in an underground garage, a man is escorted from the back of a white van and through a doorway by a guard.
While the man appears to have Jackson's build and dark hair, his face is entirely obscured.
The person who posted the video on Live Leak, the video-sharing website, claims to have been passed it by a "trustworthy source", but offers no proof of its authenticity.
"This video shows that Michael was still alive after his dead body was transported to the Los Angeles Dept. of Coroner," the video description states.
"I checked the license plate number and it looks like the King of Pop is jumping out of the same van, his dead body has been in."
However, the van's number plate is not clearly visible at any point of the clip and there is no date stamp to indicate when it may have filmed.
Even fellow users of Live Leak, which is known as a breeding ground for far-fetched conspiracy theories, were not convinced.
"Michael Jackson, Elvis, 2Pac, and Biggie are all hanging out together on some island making music, I'll have the video of that later today," wrote one.
Earlier this week the Los Angeles coroner confirmed that Jackson had lethal levels of the powerful anaesthetic propofol in his body when he died in June aged 50. His death is being treated as homicide.
http://www.telegraph.co.uk/culture/music/michael-jackson/6094032/Michael-Jackson-shown-still-alive-in-conspiracy-theorist-video-posted-on-web.html