Duncan O'Connor, played by co-star John Treacy Egan, is a supporting character in "Nights in Ballygran". He attends the Order of Ancient Celts annual St. Patrick's Day dinner and sings "Carickfergus". The dinner is later broken up by Prohibition Agents.
Appearances[edit | edit source]
|Season one appearances|
|Boardwalk Empire||The Ivory Tower||Broadway Limited||Anastasia|
|Nights in Ballygran||Family Limitation||Home||Hold Me in Paradise|
|Belle Femme||The Emerald City||Paris Green||A Return to Normalcy|