A man has been charged with arson in relation to a fatal house fire in the suburb of Mt Roskill in Auckland on Tuesday.

Police said the 25-year-old man was known to fire's victim and had been charged with one count of using a document as well as the arson charge.

He will reappear in Auckland District Court on Monday, November 14.

Linda Winifred Edwards, 58, died in the blaze.

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A post mortem had been carried out, but investigations were ongoing and further testing was needed to determine how Edwards died, police said.