A 45-year-old woman has been charged with murder and arson over the death of a man in a house fire last year.

South Australian police said the woman was arrested on Thursday and charged over the death of a 67-year-old man at Barmera, in the state's Riverland in August.

The man's body was found after a fire destroyed the Langdon Terrace home.

The woman was expected to appear in court in Berri on Thursday.