Marek Kruger was 53 years old when he died in his bed in August, 2015.
An inquest into his death has revealed Kruger died from smoke inhalation, in a house fire caused by leaving an iPhone 5 to charge overnight.
According to The Independent, Kruger had been left bed-ridden by a brain tumor two years before his death. Kruger has lost feeling down his left side as a result of the illness.
The inquest, held at Reading town hall, heard that Mr Kruger liked to do online shopping from his bed, and was known to keep his mobile phone close by. He used an extension cord to charge the device.
Jonathan Fuguet from Bureau Veritas Laboratories, the company hired by the Royal Berkshire Fire and Rescue Service to investigate the fire, spoke at the inquest. Fuguet stated the iPhone battery overheated as it was placed on the bed clothes, and the heat emitted while charging was unable to spread.