A 37-year-old man has been arrested in connection with the murder of a man in Dundonald in 2004.
He was arrested in the Bangor area over the killing of David Hamilton in the Ballybeen estate.
Mr Hamilton was beaten to death at his flat in November 2004.
The 40-year-old suffered multiple head injuries in the attack at Gleneagles Gardens.
Three men have already been convicted of his murder.