Fergal Maguire is the least seen, and only deceased, son of Paddy and Mimi Maguire. He was murdered as retribution by the family of the man Jamie Maguire murdered. The only remains ever recovered of Fergal was his hand bearing a tattoo on the wrist, confirming it belonged to Fergal. It's worth pointing out that from time to time, Mimi still references Fergal, sometimes directly, or sometimes just as a number, acknowledging that she lost him, or even just that she is still his mother, which she strangely forgets to do with Donny and Joey, whose current whereabouts are unknown.