A man has been charged with murder after an alleged fatal assault and house fire on the NSW mid-north coast.

Emergency services were called to a home on Wongala Drive in Coffs Harbour on September 7 about 5.30am following reports of a fire.

Police arrived to find the home well alight.

A 41-year-old woman escaped the home as firefighters worked to extinguish the blaze.

She was treated for minor injuries at the scene before being taken to hospital.

A crime scene was established.

Shortly after, police were called to a house on Raymond Street in Coffs Harbour, located around 1.7km away, following reports of a double assault.

A couple – a 67-year-old man and a 65-year-old woman – were found at the scene with serious head injuries.

The pair were taken to hospital in a critical c

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