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 Center in Los Angeles.
The star was preparing for his 50-night residency at London's O2 arena, which had been set to begin later this month.
Jackson died on June 25 after suffering a suspected cardiac arrest - just two days after the video was shot.
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.
'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 an 'incredible energy'.
Mr Mazur, co-founder of WireImage agency, told the Daily Mirror: 'When he hit that stage, everyone was just mesmerised.'
The photographer said Jackson was happy and joking with the dancers as he rehearsed.
Mr Mazur told the newspaper Jackson performed his set for 90 minutes until nearly midnight on June 23.
'He was totally there - 100 per cent there in fact,' said Mr Mazur. 'You would never suspect this would have ever happened - especially after his performance on stage.'
Meanwhile, it emerged today that America's anti-drugs agency had launched an investigation into Jackson's death.
The Drug Enforcement Administration (DEA) was called in by Los Angeles police to assist as they probe allegations the star was on powerful painkillers, sedatives and anti-depressants, sources close to the investigation said.
The agency has vast experience in dealing with drug abuse and could evaluate the potential role of illegal drug manufacturers known as pill mills.
Jermaine Jackson said he would be 'hurt' if toxicology reports showed his brother had abused prescription drugs.
He told NBC he did not know of any drug abuse by the 50-year-old.
But he added: 'In this business, the pressure and things that you go through, you never know what one turns to.'
Plans for Jackson's funeral were still being worked on today, with fans still waiting to hear if and where a public memorial would take place.
Brother Jermaine said he believed Neverland - the singer's vast estate in Santa Barbara, California - should be Jackson's final resting place.
