A man is being held for questioning in relation to the discovery of the body of a 22-year-old man on a roadside just outside Greystones in Co Wicklow.
Gardaí say the victim - who was 22 - had head wounds.
A 22-year-old man was arrested this afternoon and is being detained at Bray Garda Station.
Gardaí were called to an altercation and found a man lying on the Farranakelly Road at Charlesland, which links the N11 and Greystones village, at around midnight.
He was later pronounced dead at the scene by a doctor.
Gardaí say the events leading up to the altercation are under investigation and that three crime scenes are being examined.
The road where the body was found was preserved for a technical examination.
An apartment at nearby Farranakelly Close and an area of overgrown grass just a few hundred yards from the scene were also sealed off.
It is not yet clear how the man died, but it is understood that a witness saw two men fighting near the scene.
Deputy State Pathologist Dr Michael Curtis examined the body at the scene this morning and a post-mortem examination was carried out this afternoon.
Anyone with information can contact Bray Garda Station on 6665319, the Garda Confidential Line at 1800-666111 or any garda station.
