Oleg Mamiev aka Mamai, Commander of the Donetsk People's Republic and head of Pyatnashka battalion, was killed during an exchange of fire in Donbas, RIA Novosti reports.
Russian writer Zakhar Prilepin, who fights on the side of the separatists, said in a Facebook post that Mamai was killed by a grenade explosion from the automatic grenade launcher.
Mamiev came to the Donbass from Ossetia in 2014. He fought in the Vostok battalion, later he became a commander of the battalion Pyatnashka.
According to the separatist media, the funeral of Mamai takes place on Saturday. A day of mourning has been declared in DPR (Donetsk People's Republic).