MOSCOW — The former executive director of the Russian anti-doping agency, RUSADA, has died, two months after leaving his post amid Russia’s doping scandal.

RUSADA spokeswoman Nataliya Koshel confirmed Nikita Kamaev had died, two months after quitting work at the agency which is at the center of the Russia’s biggest doping scandal. He was 52.

Former RUSADA general director Ramil Khabriev told Russia’s state Tass news agency that he believed Kamaev had died at home of a “massive heart attack” after feeling pain in his chest.

Kamaev and Khabriev both quit in December as the Russian Sports Ministry pushed for the agency to carry out reforms under new leadership.