Police have revealed the man charged over the death of a 24-year-old Willunga man is his twin brother.
Detective Chief Inspector Tony Ransom confirmed that the the two men involved in the incident were twin brothers.
Police were called to a Marshall Road house just before 11am on Friday where a man from the address had been fatally shot.
South Coast CIB detectives, Major Crime and Forensic Services are examining the scene.
Just before 11am on Friday 3 March, police were called to a house on Marshall Road, Willunga after reports a man had been found deceased.
Detectives from South Coast CIB, with the assistance of Major Crime and Forensic Services are examining the scene.
The 24-year-old Willunga believed to have shot the man was immediately taken into custody when he presented himself to Christies Beach Police Station, and after being interviewed he was arrested and is expected to be charged with murder.
Police bail will be refused and he will face court on Monday, March 6.