Gardaí have begun a criminal investigation following the death of a man in Dublin last night.
The 62-year-old man has been named by gardaí as Cathal Sweeney, from Dublin.
Mr Sweeney is believed to have died following a row at a flat in Terenure.
The State Pathologist's office has been alerted and the scene has been preserved pending a forensic examination.
Gardaí are understood to be following a definite line of inquiry in relation to his death.
A man in his 30s was arrested at the flat and is being detained at Terenure Garda Station.
Gardaí think the man died after what had begun as a social event, where a number of men spent Saturday afternoon drinking and watching the Ireland and Wales rugby match.
The emergency services arrived at around a 5.45pm and treated a 62-year-old man at the scene but he died later in St James's Hospital.