Liam O'Neill was the Sergeant-at-Arms of the Sons of Anarchy Motorcycle Club's Belfast, Northern Ireland chapter on the FX original series Sons of Anarchy. Played by Irish actor Arie Verveen, Liam makes his debut on the episode "Caregiver" in the series' third season. The chapter's President, the right-hand man of Keith McGee, and member of the First 9, Liam plays a recurring role through the same season. Secretly supplying information to Jimmy O'Phelan about SAMCRO's activities, he is a secondary antagonist who met his demise in the Season 3 episode "Fírinne".
As a kid, Liam was a street tough and a recreational rioter who acted as a lookout for the True IRA.
Jimmy has O'Neill tell Jax over the phone that Abel is not in Belfast. When SAMCRO tags along with SAMBEL on a protection run for a gun shipment, O'Neill leads them into an ambush by the state police, but SAMCRO overpowers the police. SAMCRO then interrogates the officer, finding out that they have been paid to detain them by an unknown employer, most likely O'Phelan. O'Neill's back-up plan is to secretly bomb a gun shipment that SAMCRO is protecting. While he is able to detonate the bomb without raising any suspicion, the plan ultimately fails as all SAMCRO members survive without any serious injuries. Knowing he is the prime suspect in the bombing, O'Neill goes on the run. He is ultimately captured by SAMCRO, brutally tortured by Sean Casey for information about Jimmy O'Phelan, and eventually shot to death by Jax for his betrayal to the club.
- 2 unnamed IRA members - Caused explosion. ("Turas")
- 3 unnamed SAMBEL members - Caused explosion. ("Turas")
- Padraic Telford - Caused explosion. ("Turas")
- Scrum - Caused explosion. ("Turas")
|Season 3 appearances|
|"SO"||"Oiled"||"Caregiver"||"Home"||"Turning and Turning"|
|"The Push"||"Widening Gyre"||"Lochán Mór"||"Turas"||"Fírinne"|