Singer Michael Jackson has reportedly been taken to hospital in California.
Paramedics were called to his building, where they performed CPR on an unidentified patient thought to have suffered a heart attack.
Both the LA Times and the Associated Press have reported Jackson's death.
Michael Jackson sold records by the million - and broken records as well.
With the soulful vocal presence of Marvin Gaye and Stevie Wonder and the dance moves of James Brown, Jackson's appeal crossed both national and racial boundaries.
Michael Jackson's final album, Invincible (2001) was released at a time when he looked anything but.
A swirl of controversy, including Jackson's repeated assertions that his record company, Sony, had asked for their money back - all $200m of it - and that the label's chairman, Tommy Mottola, held black artists back, effectively drowned out the music.
It seemed an underwhelming end to what had been one of the most spectacular of all musical careers.
But the star was due to begin a series of sold-out comeback concerts, starting with an appearance in London next month.