A man in his 20s has died following an incident in Tyrrelstown, Dublin, on Saturday night.
It comes after an gardaí (Irish police) responded to reports of a disturbance involving a number of people at Curragh Hall Crescent in Tyrrelstown at about 22:30 local time.
The group had dispersed by the time police arrived.
A short time later, a male in his 20s arrived at Connolly Hospital Blanchardstown with serious injuries. He was subsequently pronounced dead.
A man in his 20s has been arrested and is in police custody.
Gardaí are appealing for witnesses to come forward and said they will provide an update in due course.