The report, citing the former general director of the scandal-hit agency Ramil Khabriev, said Kamayev's death had "presumably" been caused by a heart attack.
"It looks like an extensive infraction," it quoted Khabriev as saying.
"He complained of heart ache after a skiing session. He has never complained about heart problems, at least to me. Maybe his wife knew about such problems."
Russia was suspended from international athletics last November after a special commission of the World Anti-Doping Agency exposed widespread state-sponsored cheating and corruption.
Kamayev and Khabriev stood down from their positions along with the rest of the senior RUSADA management in mid-December as Russia began working on lifting the ban in time for its athletes to compete at the Rio de Janeiro Olympics in August.
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