The body of Chen Rong-yu, 23, was found slumped in a chair at a cafe in New Taipei city on Tuesday night, according to local reports.
He was rigid on a chair with his hands stretched out towards the keyboard and mouse, police said.
He had been playing League of Legends.
Mr Chen’s body had apparently been sitting there for up to nine hours without any of the 30 other people in the cafe noticing.
He was last seen by a waitress talking on the phone around noon on Wednesday.
An initial police investigation found he might have died of a cardiac arrest triggered by low temperatures.
The man’s family said he had been treated for a heart problem in September of last year.
Police are still looking into the cause of the death.
They say they suspect that a combination of tiredness, lack of movement and the cold weather could have caused blood clots and a heart attack.
Source: Sky News