The teen, known as Rustam, only stopped playing Defence of the Ancients when he had to sleep and eat. According to investigators, the teen spent more than 2,000 hours playing the game in the past year and a half.
Doctors say that Rustam may have died from second class syndrome, thrombosis. This occurs when people stay still for a long period of time without moving around to keep blood flowing. Police spokesperson Svetlana Abramova said.