Fire crews were called to the blaze in a first floor flat at Langbar Crescent, in the Easterhouse area of Glasgow, at around 5.15am.
They put out the fire while carrying out a thorough search of the property.
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Hide AdThe body of the male occupant was found in the flat's living-room.
Strathclyde Fire and Rescue's Incident Research and Investigation Section and Strathclyde Police have launched an investigation into the blaze.