His illness meant he was not able to attend Monday night's pop concert at Buckingham Palace.

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Jackson, who was at the rehearsal for a costume fitting, appeared "extremely thin" and "was not speaking normally" at the June 19, 2009, rehearsal, Sankey told jurors in a trial to determine if concert promoter AEG Live should be held liable in the pop icon's death.

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Tens of thousands of music fans gathered in Washington Sunday to see Michael Jackson, 'N Sync, Aerosmith and an array of other pop stars at a marathon concert to celebrate America and raise money for victims of September's terrorist attacks.

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