O'Riordan played an important role in the building of the National Basketball Arena, which was opened in 1993. He was also one of the members that drove the building of Neptune Stadium, a time when the prospect of a purpose-built basketball arena represented a significant step forward for the sport. He held several roles at the Neptune Basketball Club, including as Treasurer from 1958-61 and Club President, Chairman from 1979-83.

Our heartfelt thoughts and deepest condolences are with his wife Rita, his daughters Fiona, Maeve and Siobhán, his grandchildren Lily, Cara, Síofra, Oscar, Tadgh, Oran, Aisling and Finn, his brother Ria (Callanan) and the late Michael, as well as his wide circle of family and friends at this incredibly difficult time.