Facts
A fight broke out between the defendant and a woman after she mocked him. He knocked her unconscious. Unable to rouse her, he panicked, believed she was dead and threw her into a river. The medical evidence was that she was alive when she entered the water and died of drowning.
History
The defendant was tried for murder and the jury convicted him of manslaughter. He appealed against that conviction to the Court of Criminal Appeal.
Issue
What must be proved to make an unlawful act manslaughter, in particular whether the unlawful act must be dangerous and by what standard, and whether the defendant could be liable where the fatal act was done under the belief that the victim was already dead.
Held
Appeal dismissed and the conviction for manslaughter upheld.
Ratio
- An unlawful act that causes death is not by that fact alone manslaughter; the act must be one that all sober and reasonable people would inevitably recognise as exposing another to at least the risk of some harm, though not serious harm.
- Provided the act is unlawful and dangerous in that objective sense, it is not necessary to prove that the defendant foresaw that harm, nor that he intended death or serious injury.
- Where a defendant commits a series of acts that form one transaction and the victim dies in the course of it, a mistaken belief that the victim had already died before the fatal act does not prevent liability for manslaughter, following the approach in Thabo Meli v R [1954] 1 WLR 228.
The judgments
Edmund Davies J (lead)
Giving the judgment of the court, he stated the objective test of dangerousness for unlawful act manslaughter, rejecting any need for foresight of harm by the defendant, and held that the course of conduct from the assault to the throwing of the victim into the river could be treated as one transaction.
Key reasoning
- The court looked for a limiting principle for unlawful act manslaughter and found it in the requirement that a reasonable observer would recognise the risk of some harm, placing the focus on the nature of the act and not the thoughts of the defendant.
- The assault and the disposal of the victim in the river were closely linked in time and purpose, so the jury could treat them together as the conduct that caused death.
- The liability of the defendant for manslaughter did not depend on his belief about whether the victim was alive; the unlawful act was complete and dangerous when it was done.
Where it fits in the module
This case belongs to the Topic 1 and homicide debate about constructive liability: how far a person should answer for a death he did not foresee because he did a prohibited act that happened to cause it. It supplies the objective test that anchors unlawful act manslaughter, and the series of acts reasoning is the standard route to meeting the coincidence of actus reus and mens rea where the defendant mistakes the facts.
Criticisms
- The objective test of dangerousness means a defendant can be convicted of homicide without foreseeing any risk of harm, which is difficult to reconcile with the principle that criminal liability for serious results should be tied to the fault of the defendant.
- The threshold of some harm, not serious harm, is low, so a minor assault that unexpectedly causes death results in the same label as a killing reckless as to death, creating a fair labelling problem.
- Treating a series of acts as a single transaction is criticised as an artificial device to avoid the requirement that mens rea coincide with the act that causes death, producing uncertainty about when a transaction ends.
Written with AI (claude-sonnet-5.5 (Claude Code writer)) on 1 November 2026, reviewed for errors by a second model (claude-sonnet-5.5 (Claude Code checker)). Read the case itself at [1966] 1 QB 59, [1965] 2 W.L.R. 1220. Spotted an error? Tell us.