The man, who died following an accident while competing in the Killarney Forestry Rally, has been named locally.
22-year-old Eoin McCarthy from Dunmanway, Co Cork passed away in Cork University Hospital on Sunday evening, after sustaining serious injuries in the accident.
He was a member of Skibbereen and District Car Club was taking part in the rally at Mount Eagle on Sunday; his co-driver remains in CUH with non-life-threatening injuries.
Motorsport Ireland and the wider motorsport community say their thoughts are with Mr McCarthy's family, friends, co-driver and everyone involved in the event.
A full investigation into the accident is underway.