The rally driver Mr Bertie Fisher died last night in hospital from injuries sustained in the helicopter crash on Sunday that also claimed the lives of two of his children.
His wife Gladys remained in a critical condition in Belfast's Royal Victoria Hospital, where it is understood she will undergo surgery today. Family and friends were at Mr Fisher's bedside when he was pronounced dead at 11.15 p.m. His son and daughter, Mark (27) and Emma (25), died instantly when the family helicopter came down at Monea, between Derrygonnelly and Enniskillen, only miles from their home on Sunday afternoon.
A second son, Roy (23), was in a stable condition in hospital yesterday.
They were returning from a weekend at Ashford Castle in Cong, Co Mayo, where they had celebrated Mrs Fisher's 50th birthday.
Mr Bertie Fisher was well known in Irish motorsport, having won three Circuit of Ireland rallies and four Ulster rally championships. His company, Fisher Engineering Ltd, of Ballinamallard, Co Fermanagh, employs 180 people locally.
Mr Mark Fisher was a rising star on the motor racing circuit and had just signed a contract with Peugeot for the coming season.
The RUC in Enniskillen said the investigation into the cause of the crash was continuing. Air accident experts from England were continuing their examination of the wreckage, located in a wooded area.
Supt Eddie Graham said it was a tragedy. "Mr Fisher was an accomplished pilot and at this stage we don't know why the aircraft went down," he said.
The family was very well regarded in the area, he added. "It's that fact that has cut to the quick within Fermanagh and farther afield."
Mr Roy Fisher was transferred to the Royal Victoria Hospital at 10 a.m. yesterday.
His father's condition had deteriorated yesterday as he remained in intensive care at Enniskillen's Erne Hospital, and a short statement released last night by the hospital said he had died "as a result of multiple injuries".
Post-mortems will be held on the remains of the two young adults this morning.
Ms Emma Fisher worked as a chiropodist in Belfast, while Mark, a qualified structural engineer, worked at the 50-yearold family business.
Mr Wesley Knox, finance director of Fisher Engineering Ltd, said workers at the company were devastated.
"When we heard there was a helicopter accident in Fermanagh immediately I feared the worst because there are not too many helicopters in the locality." He said work would cease at the factory for the coming days.
It is thought the Fisher family's helicopter was a French-made Eurocopter Squirrel, which is regarded as one of the safest in the world. It is the helicopter used by the Garda and can carry up to six people.