Involuntary Manslaughter

Involuntary Manslaughter

Involuntary manslaughter applies where the defendant causes death but lacks the mens rea for murder (i.e. no intention to kill or cause GBH). There are two main forms: unlawful act manslaughter (constructive manslaughter) and gross negligence manslaughter.

Unlawful Act Manslaughter (Constructive Manslaughter)

This form of manslaughter is called "constructive" because liability for the death is constructed from a lesser offence. The prosecution must prove four elements:

1. An Unlawful Act

The defendant must have committed a criminal offence (not merely a civil wrong — a tort is not sufficient: R v Franklin [1883]). The offence must be an act, not an omission — R v Lowe [1973] (neglecting a child).

Common base offences:

• Assault or battery (R v Larkin [1943])
• Criminal damage
• Arson (R v Goodfellow [1986] — D set fire to his own house to get rehoused; his wife and child died)
• Administering a noxious substance (R v Cato [1976] — injecting heroin into the victim)
• Burglary (R v Watson [1989])

2. The Act Must Be Dangerous

The act must be one which a sober and reasonable person would recognise as carrying a risk of some physical harm (not necessarily serious harm). This is an objective test — the defendant's own perception is irrelevant.

• R v Church [1966] — the foundational case establishing this test: "the unlawful act must be such as all sober and reasonable people would inevitably recognise must subject the other person to, at least, the risk of some harm resulting therefrom, albeit not serious harm"
• R v Dawson [1985] — an armed robbery of a petrol station; the attendant died of a heart attack. A reasonable person present at the scene would not have known the victim had a heart condition, so the act was not dangerous. However, compare R v Watson [1989], where burglars confronted an elderly, frail man — a reasonable person who had entered and seen the victim would recognise the risk of harm
• R v JM and SM [2012] — confirmed that the dangerousness test is assessed by what a reasonable person at the scene would observe

3. The Act Must Cause Death

Standard causation principles apply (factual and legal causation). The chain of causation must not be broken.

• R v Kennedy (No. 2) [2007] (House of Lords) — D prepared a syringe of heroin and gave it to the victim, who self-injected and died. The House of Lords held that the victim's free, voluntary, and informed decision to inject himself broke the chain of causation. D was not guilty of unlawful act manslaughter because the victim's act of self-injection was a novus actus interveniens
• This overruled the earlier Court of Appeal decision and resolved conflicting case law
• Where D and V jointly participate (e.g. D holds V's tourniquet while V self-injects), the question is whether D performed the act of injection or merely assisted

4. The Defendant Must Have the Mens Rea for the Unlawful Act

The prosecution must prove that D had the mens rea for the base offence — but D need not foresee death or even harm. This is the "constructive" element and is frequently criticised for imposing murder-level consequences (albeit with a lesser label) on those who had no intention to cause serious harm.

• R v Newbury and Jones [1977] — two 15-year-olds pushed a paving slab off a railway bridge; it struck an oncoming train and killed the guard. They were convicted of manslaughter. They needed only the mens rea for the base offence (criminal damage or assault), not any foresight of death.

Gross Negligence Manslaughter

Gross negligence manslaughter arises where the defendant owes a duty of care, breaches it grossly, and that breach causes death. It was definitively restated in R v Adomako [1995].

Elements (from R v Adomako [1995])

1. The defendant owed a duty of care to the victim

2. The defendant breached that duty

3. The breach caused the victim's death

4. The breach was so gross that it should be judged criminal

1. Duty of Care

The existence of a duty is a question of law for the judge. Courts have applied the civil law negligence principles (broadly) to identify duties, but the duty must be assessed in the specific context.

Established duty situations:

• Doctor to patient — R v Adomako [1995] itself: an anaesthetist failed to notice a disconnected oxygen tube for over 4 minutes during surgery
• Employer to employee — R v Broughton [2020]
• Parent to child — R v Evans [2009]
• Drug supplier to user — R v Evans [2009]: D supplied heroin to her half-sister, who self-injected and showed signs of overdose. D and their mother failed to summon medical help. The Court of Appeal held that D owed a duty because she had created or contributed to a state of affairs that she knew was life-threatening
• Landlord/property owner — R v Singh (Gurphal) [1999]: a landlord failed to maintain a gas fire, causing a tenant's death from carbon monoxide poisoning

2. Breach of Duty

The defendant must have fallen below the standard of a reasonable person in the defendant's position. This is an objective standard.

3. Causation

Standard rules of causation apply. The breach must be a substantial and operating cause of death.

4. Grossness

The jury must determine whether the breach was so bad that it should be characterised as criminal. The question, as Lord Mackay stated in Adomako, is:

> "Having regard to the risk of death involved, was the conduct of the defendant so bad in all the circumstances as to amount, in the judgment of the jury, to a criminal act or omission?"

In R v Misra and Srivastava [2004], the Court of Appeal rejected a challenge under Article 7 ECHR (no punishment without law), holding that the Adomako test was sufficiently certain. The jury's assessment of "grossness" was not impermissibly vague.

Risk of death: In R v Rose [2017], the Court of Appeal clarified that the breach must give rise to a serious and obvious risk of death (not merely serious harm), assessed at the time of the breach. An optometrist failed to perform routine eye tests that would have detected signs of a fatal condition; the conviction was quashed because the risk of death was not obvious at the time.

Comparison

Element	Unlawful Act Manslaughter	Gross Negligence Manslaughter
Base requirement	Criminal act	Breach of duty of care
Can be an omission?	No (R v Lowe)	Yes
Risk required	Some physical harm (objective)	Serious and obvious risk of death
Mens rea	For the base offence only	No mens rea needed — objective gross negligence
Dangerousness test	Sober and reasonable person (Church)	So grossly negligent as to be criminal (Adomako)

Evaluation

Criticisms of unlawful act manslaughter:

• Constructive liability — D may be convicted of manslaughter despite no foresight of harm or death, merely because a minor unlawful act unexpectedly caused death
• The Church dangerousness test is objective, ignoring D's personal characteristics
• Kennedy (No. 2) resolved the drug supply cases but the law remains complex
• Overlap with gross negligence manslaughter causes confusion

Criticisms of gross negligence manslaughter:

• The circularity of the Adomako test — whether conduct is "criminal" is itself the question the jury must answer
• Lack of certainty — Misra upheld the test, but academic criticism continues
• The distinction between civil negligence and criminal gross negligence is unclear
• The Rose requirement of "risk of death" (not just serious harm) sets a very high threshold

Key exam points:

• Apply the four elements of each type methodically
• Use Kennedy (No. 2) for drug supply scenarios
• Distinguish the two forms clearly — especially the omission point
• Evaluate the fairness of constructive liability
• Consider Law Commission proposals for reform (e.g. a single offence of criminal killing, with degrees)