The Irish Terrorist disguised himself as a woman to get into a party held by Lord Feltchley, during the episode "Training Day". He intended to blow himself up, until Sterling Archer blew his cover by accidentally pulling off his dress. The Terrorist was in defiance of England's rule of Ireland.
Just as he was about to detonate the bomb strapped to his chest, Archer grabbed a serving tray from a nearby waiter and threw it vertically at the Terrorist's head, killing him.
The Irish Terrorist's heavy injury from the serving tray.