Essay question:
'Unlawful act manslaughter rests on incoherent foundations and should be abolished in favour of an expanded law of murder or a new statutory offence requiring foresight of serious harm.' Discuss.
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Model answer
Unlawful act manslaughter is perhaps the most philosophically contentious species of homicide in English criminal law. It permits conviction for killing on proof of a minor predicate offence—often battery or criminal damage—coupled with an objective assessment of dangerousness, without any requirement that the defendant foresaw death or serious harm. Critics contend that this violates core principles of fault, culpability and correspondence. Defenders reply that the doctrine is adequately constrained by the 'dangerousness' requirement and captures morally culpable risk-taking that warrants homicide liability. This essay examines the coherence of unlawful act manslaughter and evaluates the case for abolition.
Constructive liability and moral culpability
The central objection to unlawful act manslaughter is that it is a constructive crime: the defendant's liability for the result (death) is 'constructed' from fault regarding a lesser offence (e.g. assault). As Ashworth observes, this is incompatible with the correspondence principle, which holds that the mental element required for conviction should relate to the harm for which the defendant is punished (Principles of Criminal Law, 9th edn, 135). A person who pushes another in anger, intending no more than momentary discomfort, cannot be said to have chosen or risked death; their culpability is for battery, not killing. If the victim falls, strikes his head and dies, the legal outcome—a manslaughter conviction and potentially a long custodial sentence—is, the critics say, driven by fortuity rather than fault.
This concern is sharpened by the breadth of the doctrine. So long as the predicate act is criminal and objectively dangerous, even a minor offence suffices. In R v Goodfellow (1986), the defendant committed arson to secure rehousing; the fact that his motive was not to harm does not matter. In R v Cato [1976] 1 WLR 110, injection of heroin constituted the unlawful act (pre-Kennedy). The variety of base offences—and the minimal fault required—makes the scope of unlawful act manslaughter very wide.
The 'dangerousness' constraint
Proponents argue that the Church test of objective dangerousness cabins the doctrine. The requirement that 'all sober and reasonable people would inevitably recognise' a risk of 'some harm' ensures that only genuinely risky conduct is caught. Williams recognised this, conceding that 'some harm' is a meaningful threshold, though he remained critical of the doctrine overall (Textbook of Criminal Law, 2nd edn, 236).
However, 'some harm' is a modest standard. It need not be serious harm, nor harm of the kind that in fact occurred (DPP v Newbury [1977] AC 500). The defendant may be entirely inadvertent to the risk, yet the objective nature of the test allows conviction. Tadros defends this by arguing that a person who commits an unlawful and dangerous act manifests insufficient concern for others and is properly held responsible when harm eventuates ('The Limits of Manslaughter', in Criminal Law Theory). Yet it is difficult to see why the manifestation of insufficient concern, without subjective awareness of risk, should ground liability for killing—the most serious non-murder offence. Simester and others argue that liability should track the defendant's capacity and opportunity to conform conduct to law (Simester and Sullivan, 7th edn, 306); constructive liability fails this test.
Arguments for abolition
Glanville Williams and the Law Commission (Law Com No 237, 1996) both recommended abolition of unlawful act manslaughter. The Commission proposed a new statutory offence of 'reckless killing', requiring proof that the defendant was aware of a risk of death or serious injury and unreasonably took that risk. This would align involuntary manslaughter with the subjective fault principle affirmed in R v G [2003] UKHL 50 for recklessness.
The advantages of abolition are clear. It would end the incongruity whereby a minor offence coupled with bad luck attracts a manslaughter conviction, while conduct falling short of a criminal act—however reckless—does not. It would restore correspondence between fault and outcome. And it would reduce the very wide sentencing range that involuntary manslaughter currently entails, enabling more consistent punishment.
Moreover, abolition would not leave a gap. Cases of true culpability—where the defendant does foresee death or serious harm—would be murder. Cases of gross inadvertence would remain within gross negligence manslaughter. What would be lost is the category of cases where the defendant commits a minor crime, does not foresee serious consequences, but bad luck intervenes. It is precisely this category that critics say should not attract homicide liability in the first place.
Arguments for retention
Defenders of the status quo emphasise pragmatic and symbolic considerations. Unlawful act manslaughter captures cases where the defendant has violated the criminal law in a dangerous way, and someone has died as a result. There is a public interest in marking the fatal outcome with a homicide conviction, even if the defendant's subjective fault was limited. The label 'manslaughter' reflects the seriousness of causing death; a mere conviction for battery does not.
Further, the scope of murder is narrower in England than in many jurisdictions (intent to kill or cause GBH), and the mandatory life sentence makes courts reluctant to expand it. Abolishing unlawful act manslaughter without reforming murder would mean that some culpable killings escape homicide liability altogether.
Finally, there is institutional inertia. Despite two decades of Law Commission recommendations, Parliament has not acted. Courts apply Church and its progeny competently; juries understand the directions. Radical reform requires legislative will and political capital that have not been forthcoming.
A middle path?
Several scholars propose compromise. Horder suggests that the predicate offence should be restricted to crimes of violence, as in Australia (Wilson v The Queen). This would exclude constructive liability arising from property offences or regulatory crimes. Ashworth tentatively proposes that the dangerousness threshold be raised to 'serious harm', narrowing the scope without abolition.
Another option, canvassed by the Law Commission, is to retain constructive liability only where the defendant is subjectively reckless as to some harm (not necessarily serious harm). This would preserve the objective dangerousness limb but add a minimal fault requirement, avoiding conviction of the entirely inadvertent wrongdoer.
Conclusion
Unlawful act manslaughter does rest on theoretically incoherent foundations. It violates the correspondence principle, sweeps widely, and punishes luck as much as fault. The case for abolition in favour of a fault-based statutory offence is strong on principle. Yet the pragmatic arguments—institutional familiarity, the symbolic value of a homicide conviction where an unlawful act causes death, and the absence of a broader homicide reform package—explain its persistence. The question ultimately turns on whether one privileges doctrinal coherence or practical functionality. On balance, the doctrine's conceptual weaknesses and its unprincipled breadth support abolition, but only as part of a comprehensive statutory scheme that realigns the structure of homicide offences. Piecemeal abolition without replacement risks creating lacunae and inconsistency. Until Parliament legislates, the doctrine remains embedded in English law, notwithstanding its contested legitimacy.