Police investigating a fatal house fire at Stockton last month are now treating the blaze as a murder investigation.

The fire in the Housing Commission flat on Fullerton Street on July 26 claimed the life of 55-year-old Graham Cameron, who was the sole occupant of the 1 bedroom flat.

Fairfax reports a neighbour heard loud banging noises coming from Mr Cameron’s unit in the hours before the fire broke out but wasn’t game to investigate following a separate incident weeks earlier involving police and a second unit, where it’s alleged a large quantity of drugs and cash were found.