Hundreds of people are taking to online social media site Twitter to offer their condolences to the family and friends of the retired RTE broadcaster.
he 76-year-old passed away at his home this morning.
A tearful Eamon Dunphy has hailed Bill O'Herlihy as a great broadcaster, stating that his ability to engage people set him apart from all others.
"He was a fantastic broadcaster and a very, very nice man. A decent man and great fun.
"He had a journalist's sharp instincts and he'd often pull me up, or Liam Brady in particular. Behind it all, we were all great friends."
"He was by far the most important person on that panel. He was the catalyst for all that was good on it.
FAI chief executive John Delaney echoed those sentiments.
"We are all deeply shocked and saddened at the passing of Bill O’Herlihy," he said. "A true national treasure, he was a fantastic journalist and interviewer, who made a unique contribution to Irish sports journalism. I have known him for over twenty years.
"We offer our sincere condolences to his family, his wife Hilary, and his daughters Jill and Sally."