Exiled Russian tycoon Boris Berezovsky has been found dead at his home in Surrey.
The circumstances of the death of Mr Berezovsky – a wanted man in Russia, and an opponent of President Vladimir Putin – are not yet known.
He was a former Kremlin power-broker whose fortunes had declined under Mr Putin. Berezovsky emigrated to the UK in 2000.
Last year, he lost a £3bn ($4.7bn) damages claim against Chelsea Football Club owner Roman Abramovich.
Mr Berezovsky claimed he had been intimidated by Mr Abramovich into selling shares in Russian oil giant Sibneft for a “fraction of their true worth”.
The allegations were completely rejected by the London Commercial Court judge, who called Mr Berozovsky an “inherently unreliable” witness.