English law defines manslaughter by unlawful act, often termed constructive manslaughter, as an offence that arises where an unlawful and dangerous act causes death. This formulation has attracted sustained academic criticism for departing from subjectivist principles in criminal law. Subjectivism holds that criminal liability should generally attach only to consequences that a defendant intended or foresaw. The present essay critically analyses the statement through the lens of one-punch killings, cases in which a single blow results in fatal injury despite the defendant envisaging only minor harm. It argues that although the objective test of danger produces principled outcomes in some respects, it creates inconsistency with subjectivist orthodoxy.
The Legal Framework of Unlawful Act Manslaughter
The contemporary definition derives principally from the judgment in R v Church [1966] 1 QB 59. There the Court of Appeal held that the unlawful act must be one that “all sober and reasonable people would inevitably recognise must subject the other to, at least, the risk of some harm”. This objective assessment of danger was reaffirmed in DPP v Newbury [1977] AC 500, where their Lordships emphasised that foresight by the defendant is irrelevant. The act itself must be criminal, typically an assault, and must cause death. In one-punch scenarios the prosecution routinely relies upon the battery inherent in the strike, coupled with the objective recognition that any blow carries a risk of at least minor injury.
Subjectivism and the Breach of Principle
Subjectivist theory, articulated most clearly by Hart and later developed by Ashworth, insists that moral culpability rests upon the defendant’s actual mental state. Liability for unforeseen consequences, it is argued, violates the principle of fair labelling and deserts. Constructive manslaughter circumvents this requirement by substituting an objective yardstick for subjective awareness. Consequently, a defendant who delivers a single punch, reasonably expecting nothing more than transient pain, may nevertheless be convicted of manslaughter if death ensues from an undiagnosed medical condition. The law therefore imposes liability for a consequence lying outside the defendant’s contemplation, a result that appears unprincipled from a subjectivist standpoint.
One-Punch Killers and the Objective Test in Practice
One-punch fatalities illustrate the tension vividly. In such cases medical evidence often establishes that the punch itself was not of lethal force; rather, the victim’s fall or an underlying vulnerability produced the fatal outcome. The objective test nevertheless captures the conduct because any punch is recognised by ordinary observers as carrying a risk of some harm. This approach ensures that serious harm is not excused merely because the defendant miscalculated, yet it simultaneously exposes defendants to manslaughter convictions disproportionate to their culpability. Judicial attempts to mitigate the severity, visible in sentencing remarks that stress the unintended nature of death, underline the doctrinal strain. The recent emphasis on community impact statements in such cases further reveals that outcomes are shaped by consequentialist considerations rather than strict adherence to subjective fault.
Arguments in Defence of the Current Approach
Defenders of constructive manslaughter point to the protective function of the objective test. By requiring only that sober and reasonable people would recognise a risk of some harm, the law maintains a residual category of liability for dangerous violence that results in death. Complete subjectivisation, it is contended, would permit defendants to escape responsibility by asserting idiosyncratic beliefs about the harmlessness of their conduct. Moreover, the threshold of “some harm” remains modest; the law does not demand foresight of death or even serious injury. Thus the breach of subjectivism may be viewed as a limited and defensible concession to the seriousness of fatal outcomes.
Reform Proposals and Residual Difficulties
The Law Commission has repeatedly considered reform. Its 1996 report recommended the abolition of constructive manslaughter in favour of a general offence of reckless killing. Such a change would restore greater alignment with subjectivist principles by requiring subjective awareness of a risk of death or serious injury. However, Parliament has not enacted these proposals. The continued existence of the offence therefore reflects a policy choice that prioritises the protection of victims over doctrinal purity. For one-punch killers the practical effect is that prosecutorial discretion and sentencing leniency, rather than substantive legal reform, have become the principal mechanisms for avoiding perceived injustice.
Conclusion
The statement that unlawful act manslaughter is unprincipled because it breaches subjectivism contains substantial truth. The objective test of danger permits liability for consequences neither intended nor foreseen by the defendant, a position most starkly illustrated in one-punch cases. While the rule secures a measure of public protection and avoids evidentiary difficulties associated with proving foresight, it does so at the cost of consistency with fundamental principles of culpability. Until legislative reform occurs, the offence will remain an anomalous yet entrenched feature of English homicide law.
References
- Ashworth, A. (2009) Principles of Criminal Law, 6th edn. Oxford: Oxford University Press.
- Hart, H.L.A. (2008) Punishment and Responsibility: Essays in the Philosophy of Law, 2nd edn. Oxford: Oxford University Press.
- Law Commission (1996) Legislating the Criminal Code: Involuntary Manslaughter, Law Com No 237. London: HMSO.
- Simester, A.P., Spencer, J.R., Sullivan, G.R. and Virgo, G.J. (2019) Simester and Sullivan’s Criminal Law: Theory and Doctrine, 7th edn. Oxford: Hart Publishing.
