Michael Jackson rehearsal video

Footage of Michael Jackson performing some of his most famous hits for the final time has been released.

The King of Pop looked well and his voice sounded strong as he danced around the stage in typical fashion during rehearsals at the Staples Centre, in Los Angeles.

The star was preparing for his 50-night residency at London's O2 arena, set to begin later this month.

Jackson died on June 25 after suffering a suspected cardiac arrest.

Jackson's friend, Uri Geller, said tonight the footage raised a "big question" about what prompted the star's dramatic demise.

"The question is: What happened from that point to the day that he died?" said Geller. "In the photographs I've seen, he looked in shape, he was smiling, he was happy.

"What happened? That's the big question."

Kevin Mazur, 48, the photographer who captured some of Jackson's final moments on camera at the rehearsals, said the star appeared to be back to his best and had a "incredible energy".