Alexander Litvinenko

The ex-Russian agent, who fled to London, fell ill in November 2006 after being poisoned by radioactive polonium-210. Two days before his death on 23 November he told his father he had converted to Islam.

From: http://www.independent.co.uk/news/people/profiles/timothy-winter-britains-most-influential-muslim--and-it-was-all-down-to-a-peach-2057400.html

Vladimir Putin invited to Islam