Three men are now being questioned in connection with the death of a 28-year-old man in Portstewart, Co Derry, at the weekend.
A 19-year-old man was arrested in the Coleraine area this morning.
Two other men, aged 20 and 31, were detained yesterday.
Trevor Spiers was injured in a fight outside a nightclub on the Promenade shortly before 2am on Sunday.
Mr Spiers was given first aid but he died later in hospital.
