A man in his 50s was critically ill after being beaten about the head during a row in a housing estate.
The man was injured in a confrontation involving a group of men in the Hermitage area of Ennis, Co Clare.
Gardai said the man sustained a serious head injury.
The dispute took place at about 6.30pm on Thursday evening and the man was taken by ambulance to Limerick Regional Hospital.
Gardai in Ennis have appealed for information and witnesses to come forward.