By Will Stewart In Moscow For Dailymail.com20:31 12 Nov 2015, updated 21:29 12 Nov 2015

"The death from a 'heart attack' of a longtime close ally of Vladimir Putin in a Washington hotel has led to a swirl of speculation that he was murdered on Moscow's orders after offering to help the FBI.

The shock death has created an eave of speculation in Moscow that it is related to previous reports that he was helping the FBI - and could be murder.

There are even separate allegations that Lesin may still be alive, with his demise faked by the US authorities.

Kokh spoke amid fears in Moscow that he was ready to trade his inside knowledge of the Putin court for an end to any American investigation into the propriety of his wealth.

Human rights activist Pavel Chikov claimed the death of a man with an intimate knowledge of Putin's circle, was suspicious, stating: 'It would be right to assume that Lesin, who knows quite a lot, was ready for a deal within the FBI's investigation, which would make his position better.

'You don't normally go to Washington for treatment or for business but to communicate with officials.' " Quotes from Daily Mail website:

http://www.dailymail.co.uk/news/article-3315994/Vladimir-Putin-s-me...