Emergency services were called at 7.55pm yesterday (Saturday) to an address in Brixham Walk, Corby.
On arrival, firefighters were confronted with a well-developed fire spreading through the house.
The initial crews worked to ensure everyone was out of the building and to prevent the blaze from spreading further.
At the height of the fire there were five pumps and a total of 30 firefighters tackling the blaze.
A 24-year-old man and a 24-year-old woman managed to escape from the property via an upstairs window, but firefighters discovered the 46-year-old victim within the living room area.
He was confirmed dead at the scene and the blaze is not being treated as suspicious.
Subsequent investigations have confirmed the cause of the fire was a chip pan on the stove in the kitchen.
Smoke alarms were found in a bag inside the property, with no batteries in them.
Officers from Northamptonshire Police are supporting the family at this time.
Det Chief Inspector Phil Mills,of Northamptonshire Police, said: “Our thoughts are with the family and the local community at this tragic time.
“Police and fire crews will be working within the local community today, providing safety advice, including the importance of having smoke detectors, along with reassurance to local residents.”