Police have charged a 24 year old man with murdering his twin brother at a Willunga property, south of Adelaide.

Earlier today, police were called to a house on Marshall Road after reports a person had been found deceased.

The man, aged 24, had sustained a fatal gunshot wound.

A 24-year-old Willunga man was taken into custody at the Christies Beach Police Station. He was interviewed, arrested and is expected to be charged with murder.

He will be refused police bail and will appear in court on Monday 6 March.

The investigation is continuing and anyone with information that may assist police is asked to contact Crime Stoppers on 1800 333 000.