McGarrigle's driver is a supporting character in "Battle of the Century". He is the driver of Sinn Féin fundraiser John McGarrigle and a member of the Irish Republican Army (IRA). He accompanies him to a meeting with American arms dealer Nucky Thompson in a mortuary basement on July 1, 1921. He later brings McGarrigle to a demonstration of the Thompson machine gun by Nucky on the estate of an IRA leader. He brings McGarrigle to say goodbye to Nucky the next day. McGarrigle is murdered by fellow IRA leader Patrick after declining Nucky's proposal to trade weapons for liquor. His driver runs off when Patrick shoots him.
|Season two appearances|
|21||Ourselves Alone||A Dangerous Maid||What Does the Bee Do?|
|Gimcrack & Bunkum||The Age of Reason||Peg of Old||Two Boats and a Lifeguard|
|Battle of the Century||Georgia Peaches||Under God's Power She Flourishes||To the Lost|