A British judge investigating the sudden death of a Russian mafia whistle-blower heard on Monday that he might have been murdered by eating poisoned soup.

Alexander Perepilichny, 44, was found dead near his luxury home on the exclusive gated St. George's Hill estate in Weybridge, Surrey, southwest of London, after he had been out jogging in November 2012.

The sudden nature of the death of Perepilichny, who had sought refuge in Britain in 2009, and his role in helping a Swiss investigation into a Russian money-laundering scheme has sparked speculation that he might have been murdered.