O'Reilly was convicted of driving with undue care, and fined 4 pounds, and since then he has rarely driven, especially at night., O'Reilly joined Heinz.
There he made his name in international business, becoming MD of the Heinz subsidiary in the UK, its largest non-US holding and the source of half of the group profit. in 1980, with a thesis on agricultural incomes and marketing in Ireland.
He scored his four tries for Ireland against France on 28 January 1956; against Scotland on 25 February 1956; against Wales in 1959; and against France in 1963.
He made his final appearance for Ireland on 14 February 1970, after a six-year absence from the national team, O'Reilly toured twice with the British Lions, on their 1955 tour to South Africa and their 1959 tour to Australia and New Zealand.
O'Reilly, named "Tony" after his mother's favourite brother, grew up on Griffith Avenue, a broad middle-class street in the Drumcondra/Glasnevin area of Dublin. He holidayed with family, including an aunt in Balbriggan, cousins in Sligo and others in Drogheda. Educated at Belvedere College from the age of six, O'Reilly was known for sporting proficiency in football, cricket and tennis and rugby union. In cricket he was a member of the Junior Cup-winning team in 1950; in tennis, he was in a Leinster Schools Cup-winning team, and reached the under-15 national semi-finals.
He was also noted for his acting skills (notably in Gilbert and Sullivan operettas such as Iolanthe, and Dunsany's A Night at an Inn).
As a rugby player, he represented Ireland, the British and Irish Lions and the Barbarians and is enshrined as a member of the International Rugby Board's Hall of Fame.
O'Reilly has six children and 19 grandchildren and is married to Chryss Goulandris.
He played 15 games during the 1955 tour, scoring 16 tries.
He was an altar boy, and a regular attender at chapel, and during his time there spent a summer in the Gaeltacht to improve his Irish language skills.
He passed the Leaving Certificate at 17, and with four school mates, studied philosophy, still at Belvedere, for a year after this, while developing his rugby.
He played in all six tests, two against Australia and four against New Zealand.
He scored tries in the two test wins against Australia and in the first and fourth tests against New Zealand.