Russia's former anti-doping chief Nikita Kamaev has died of a heart attack aged 52.
His death comes just two months after he resigned from his post with RUSADA, the agency at the centre of Russia's biggest doping scandal.
'The preliminary cause of death was a massive heart attack,' RUSADA said in a statement.
The news comes after Russia was suspended from international athletics last November because The World Anti-Doping Agency (Wada) accused Russian athletics of state-backed doping, corruption and extortion.
Kamaev resigned in December, a month after RUSADA was stopped from conducting drug tests.
‘He will remain in our memories as an experienced and understanding leader, distinguished by his high professionalism,’ the RUSADA statement said.
Kamaev is the second former senior RUSADA official to die this month. Founding chairman Vyacheslav Sinev, who left the agency in 2010, also passed away on 3 Feb.