His cause of death is now unclear.
Nikolai Glushkov, who received political asylum in the United Kingdom, was found dead at his London home on Monday by friends and family. Police said he committed suicide but Glushkov told The Guardian in 2013 that he suspected foul play.
They added there is no evidence to suggest the death is linked to the incident in Salisbury, where a former Russian spy Sergei Skripal and his daughter Yulia were poisoned with nerve agent which the United Kingdom government believes came from Russia.
Glushkov's death came a week and a day after fellow Russian exile Sergei Skripal and his daughter Yulia were critically injured in a nerve agent attack in Salisbury.
He was found dead on Monday night.
The death of a 69-year-old Russian man in London is being investigated by counter-terrorism police, Scotland Yard has said. A post-mortem examination will be held in due course. "If there is a change in the status of the investigation, an update will be provided", the Met said.
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Nikolai Glushkov, 68, who lived in Clarence Avenue and was a former associate of the late Russian tycoon Boris Berezovsky, was found dead in London on Monday, his associates said.
Glushkov, who worked for Berezovsky's LogoVAZ auto company, was charged with money laundering and fraud and spent five years in jail from 1999.
Glushkov received political asylum in London and gave evidence in Berezovksy's court case against Chelsea owner Roman Abramovich in 2011.
Glushkov is believed to have two grown up children, Natasha and Dima, and an ex-wife who lives in Moscow.
Glushkov received political asylum in Britain after serving five years in prison in Russian Federation for money laundering and fraud, the Guardian newspaper reported.