Donal English Hayden and his brother were in a tractor and trailer combination that overturned and ended up in a river.
The accident happened around two miles outside the town of Ballon at around 10:30am.
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They were both brought to St Luke's Hospital in Kilkenny, where Donal died of his injuries.
His 15 year old brother suffered minor injuries and was released from hospital.
Fine Gael TD for Carlow Kilkenny, Pat Deering, says yesterday was a 'very black day' for the local community.