The boy who was struck by a car in Lisburn earlier this week has died in hospital.
The six-year-old and his twin brother were hit by the vehicle on Railway Street on Wednesday afternoon.
The police confirmed last night that the boy, named locally as Diarmuid Frazer, had passed away.
His brother Cormac remains in a stable condition at the Royal Victoria Hospital in Belfast.
Earlier this week the young boys' primary school held a special assembly for the pair.
Ballymacward PS principal Brendan Sadlier said: "After hearing the distressing news, this morning we had a special assembly for pupils and staff.
"The thoughts and prayers of the school are with the family at this very difficult time."
Since the tragic incident occurred the boys' family had maintained a vigil at the bedside of the youngster at the Royal Victoria Hospital in Belfast.
Medics were on the scene within minutes and rushed the pair to the Belfast hospital.
It is understood the family are from the Crumlin area.
The road where the accident occurred is currently undergoing roadworks and it is was particularly congested at the time.
The collision is believed to have happened where two lanes of traffic merge into one. Railway Street in Lisburn was closed to traffic for several hours following the crash and diversions were put in place.
Last night DUP councillor Scott Carson said: "The news that this six-year-old boy has passed away is a tragedy.
"It will be a shock to many within Lisburn.
"The circumstances by which it came about were very unfortunate and I know the classmates and school pupils of the boys, that they were praying for them and remembering them over the past couple of days, but unfortunately were saddened to hear that he has lost his life as a result of this.
"It just brings home the dangers of children in the proximity of a main road, even in 30mph speed limit in the centre of Lisburn.
"Where children and vehicles are close by there's always a risk and in this case that has meant a loss of life."
The accident came just days after 14-year-old Mark Colgan was killed as he was struck by a van as he waited to catch the bus to school.
That fatality happened on the Scarva Road in Banbridge, Co Down.