VIDEO: WATCH Michael Jackson's final performance

See backstage footage of the King of Pop rehearsing for his This Is Tour

A new video has emerged of Michael Jackson rehearsing for his comeback This Is It tour.

The 45-second clip shows the King of Pop running through the moves for his hit song Human Nature.

Michael is seen singing and practising some dance steps in preparation for his 50-night tour at the 02 Arena in London.

The 50-year-old pop prodigy died of a heart attack in June.

The new footage has been released by Sony to whet fans' appetites for the forthcoming film compilation of his rehearsals.

It was filmed at The Forum and the Staples Centre in Los Angeles.

Critics are already saying Michael sounds weak and looks slow, compared with his performances in his prime.

But fans have defended him online, saying the footage only shows him rehearsing when he would not be throwing himself into his performance.

The new film This Is It is due to be released on 28 October.

It features Michael mentoring his team of dancers for the tour, plus scenes of him creating and developing the complicated stage shows.

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