
Berezovsky: Colorful Russian oligarch —
Boris Berezovsky began his working life as a math professor, and then a systems analyst, before switching to more lucrative jobs, according to CNN's Jill Dougherty. He is pictured here at Moscow airport in 1999.

Berezovsky: Colorful Russian oligarch —
Berezovsky became a deputy of the State Duma but fled Russia for Britain once Vladimir Putin became president in 2000.

Berezovsky: Colorful Russian oligarch —
In 2007, Berezovsky was involved in establishing a foundation to investigate the death of former Russian spy Alexander Litvinenko.

Berezovsky: Colorful Russian oligarch —
In July 2007, Berezovsky told media that UK police had warned him that they believed his life was under threat from a Russian assassin.

Berezovsky: Colorful Russian oligarch —
Berezovsky said he had briefly fled abroad because of threats against him.

Berezovsky: Colorful Russian oligarch —
In 2011, Berezovsky alleged a breach of contract over business deals with fellow Russian and Chelsea Football Club owner Roman Abramovich.

Berezovsky: Colorful Russian oligarch —
Berezovsky leaves the High Court in London with his partner Yelena Gorbunova, left, in 2011.

Berezovsky: Colorful Russian oligarch —
On August 31, 2012, Berezovsky lost his lawsuit against Abramovich.

Berezovsky: Colorful Russian oligarch —
On March 23, 2013, Berezovsky's son-in-law said on Facebook that the tycoon had died.