Involuntary manslaughter: unlawful act (constructive) manslaughter and gross negligence manslaughter, their elements and leading cases.

What this dot point is asking

OCR Component 1 Section B requires you to know involuntary manslaughter: unlawful killings where the defendant lacked the intention to kill or cause grievous bodily harm (so it is not murder), but is still criminally liable. There are two forms: unlawful act (constructive) manslaughter and gross negligence manslaughter. The skill is to identify which form fits the facts and apply its elements for AO2.

The answer

Unlawful act (constructive) manslaughter

There are four elements:

1. An unlawful act. The defendant must commit a criminal act (Lamb shows a mere frightening act that is not itself a crime will not do; an omission cannot found this offence, R v Lowe). Common base crimes are battery, assault or criminal damage.
2. A dangerous act. Judged objectively: a sober and reasonable person would recognise that the act carried the risk of some harm, albeit not serious harm (Church; R v Dawson, where the harm must be physical, though shock can count where a frail victim is foreseeably present, R v Watson).
3. Causation. The unlawful act must cause the death (factual and legal causation; R v Mitchell, where a push set off a chain reaction; R v Goodfellow).
4. Mens rea for the unlawful act. The defendant must have the mens rea for the base crime (for example intention or recklessness as to a battery), but need not foresee death or any harm (R v Newbury and Jones).

Gross negligence manslaughter

This form does not need a base crime; it rests on a grossly negligent breach of a duty of care. The test comes from R v Adomako and has four elements:

1. A duty of care. The defendant owed the victim a duty (ordinary negligence principles; doctors, anaesthetists, electricians, employers and even drug-suppliers in some circumstances, R v Evans).
2. Breach of duty. The defendant fell below the standard of the reasonable person in that role.
3. Causation. The breach caused the death.
4. Gross negligence. The negligence was so bad that it goes beyond mere compensation and, in the jury's view, amounts to a criminal act or omission. There must be a serious and obvious risk of death at the time of the breach (R v Rose; R v Rudling; R v Sellu), assessed on what was known then, not with hindsight.

Examples in context

A strong scenario answer chooses the right form, runs its specific elements, and concludes.

Try this

Q1. Explain the four elements of unlawful act manslaughter. [12 marks]

• What the marker wants. Precise AO1: an unlawful (criminal) act, not an omission (Lowe); dangerous on the objective Church test; causing death (Mitchell); with the mens rea for the base crime but no need to foresee death (Newbury and Jones).

Q2. A nurse, Greg, fails to monitor a patient after surgery; the patient deteriorates unnoticed and dies. Discuss Greg's liability for gross negligence manslaughter. [20 marks]

• Cue. An AO2 application of Adomako: a duty of care (nurse to patient); breach (failing to monitor); causation (the breach caused death); gross negligence with a serious and obvious risk of death (Rose, Rudling), concluding on liability.