Northern Ireland v Lynch [1975] AC 653
Crime – Duress – Murder – Aiding and Abetting – Defence of Duress
Facts:
The defendant was charged with aiding and abetting a second degree murder. He drove members of the Irish terrorist group the IRA into town where they had shot and killed a police officer. At the trial, the Defendant claimed that he was under duress and was threatened that if he did not drive the members, he would be killed. His defence was struck out so he appealed.
Issues:
The issue was whether the Defendant could rely on the defence of duress.
Held:
The appeal was allowed. The Defendant was able to rely on the defence of duress against a charge of murder. Even though there were clear actions by the Defendant that showed his participation and his contribution in the act of murder, i.e. driving the members and likely knowing that serious bodily injury or possibly death would result by him taking them to and from the scene, as he was forced to do so against his will and did so because his life was threatened or in serious danger, it was not necessary to prove his intent to murder. In any event, a charge of aiding and abetting does not require a proof of intent to murder. Given the circumstances that caused him to assist by driving the members were extreme and left him with little alternative option (potentially his own death), he was able to rely on a he defence and a new trial was ordered.
Updated 19 March 2026
This case summary is broadly accurate as a description of the House of Lords’ decision in Director of Public Prosecutions for Northern Ireland v Lynch [1975] AC 653. However, readers must be aware of a critical subsequent development: Lynch was expressly overruled by the House of Lords in R v Howe [1987] AC 417. In Howe, the House of Lords held that duress is not available as a defence to a charge of murder, whether as a principal offender or as an aider and abettor. This position was confirmed and extended in R v Gotts [1992] 2 AC 412, where the House of Lords held that duress is equally unavailable as a defence to attempted murder. The rule in Howe remains the current law in England, Wales, and Northern Ireland. Accordingly, while Lynch remains historically significant and is still studied as part of the development of the law of duress, its central legal holding — that duress can be a defence to a charge of aiding and abetting murder — is no longer good law. Students should treat this case as an overruled authority and focus on Howe as the authoritative statement of the current position.
