Doyle, (63) was in a car which was in a collision with a lorry on a stretch of road at Quinn's Corner near Dungannon, on the Omagh to Dungannon road in County Tyrone.
He coached Ireland to the Triple Crown and the old Five Nations Championship in 1985. Ireland's Triple Crown this season was theirfirst since Doyle's team achieved the feat 19 years ago.
Doyle also won 20 consecutive caps as a flanker for Irelandbetween 1965-68, touring Australia with Ireland in 1967 and South Africa withthe British and Irish Lions the following year.
IRFU President, John Quilligan in paying tribute to the 'larger than life character of greatpopularity," said,"It is with a great sense of shock and sorrow that I have learned ofthedeath of Mick Doyle. On my own behalf and that of the Irish RugbyFootballUnion, I would like to express my heartfelt sympathy to Mandy and alltheDoyle family on their tragic loss.
"He gave the game great service in his associations with Ireland, theLions,U.C.D., Blackrock College, Garryowen, Cork Constitution, Cambridge University and EdinburghWanderers as aplayer, and then with Leinster and Ireland as a selector and coach.
"More than that, Mick was also a larger than life character of greatpopularity, who will be sorely missed in all rugby circles. May herest inpeace."
In addition a staement from the Ulster Branch IRFU read, "It is with great shock that the Ulster Branch of the IRFUlearned ofthe tragic death of Mick Doyle this morning.
"As well as being adistinguished player and coach, he was also one of rugby's greatcharacters who will be sorely missed.
"All at Ulster Rugby extend theirdeepest sympathies to the family circle."