Murder: The Actus Reus and Mens Rea

Murder is a common law offence. The actus reus is the unlawful killing of a human being under the King’s peace. The mens rea is malice aforethought, which means either:

• An intention to kill; or
• An intention to cause grievous bodily harm (GBH)

Intention here means direct or oblique (indirect) intention. Direct intention is where the defendant’s purpose is to kill or cause GBH. Oblique intention arises where death or GBH is not the defendant’s purpose but is a virtually certain consequence of their actions, and the defendant appreciated that to be so (R v Woollin). This is an evidential rule — foresight of virtual certainty is evidence from which the jury may infer intention, not a definition of intention.

Voluntary Manslaughter: Partial Defences to Murder

Three partial defences can reduce a murder conviction to voluntary manslaughter. They do not result in acquittal — they result in a conviction for the lesser offence, which carries a discretionary rather than mandatory life sentence.

Loss of Control

The Coroners and Justice Act 2009 replaced the old provocation defence. The defendant must show:

1. They lost self-control (which need not be sudden);
2. The loss of control was attributable to a qualifying trigger (fear of serious violence from the victim, or circumstances of an extremely grave character causing the defendant to have a justifiable sense of being seriously wronged); and
3. A person of the defendant’s sex and age with a normal degree of tolerance and self-restraint in the same circumstances might have acted in the same way.

The defence is excluded where the defendant incited the trigger as an excuse for violence, or where the trigger is purely sexual infidelity.

Diminished Responsibility

Under s.2 Homicide Act 1957 (as amended by the 2009 Act), the defendant must prove on the balance of probabilities:

• An abnormality of mental functioning arising from a recognised medical condition;
• That substantially impaired their ability to understand the nature of their conduct, form a rational judgment, or exercise self-control; and
• That provides an explanation for, or is a significant contributory factor in, the killing.

The 2009 Act tightened diminished responsibility significantly. The abnormality must now arise from a recognised medical condition — this excludes intoxication alone, though voluntary intoxication combined with an underlying condition may still qualify.

Suicide Pact

Where the defendant kills another person in pursuance of a suicide pact (a mutual agreement to die) and survives, they may rely on this defence. It arises rarely in SQE1 questions but should be known.

Involuntary Manslaughter

Involuntary manslaughter is unlawful killing without the mens rea for murder. There are two main types tested in SQE1:

• Unlawful act manslaughter (constructive manslaughter): The defendant commits an unlawful act (must be a criminal act — a civil wrong is insufficient); the act is objectively dangerous (likely to subject the victim to some harm, albeit not serious harm); and death results. The defendant need not foresee any harm at all.
• Gross negligence manslaughter: The defendant owes a duty of care to the victim; they breach that duty; there is a serious and obvious risk of death; and the breach is so grossly negligent as to be criminal (R v Adomako). This form frequently arises in professional contexts — doctors, care home workers, employers.

Key Exam Technique for Murder/Manslaughter Questions

SQE1 questions on this topic often present a scenario where the defendant has caused a death and ask you to identify the most appropriate charge, or whether a partial defence applies. Work through a clear structure:

• Can the prosecution establish the actus reus and mens rea of murder?
• If yes, do any partial defences reduce it to voluntary manslaughter?
• If the mens rea for murder is absent, does the conduct constitute involuntary manslaughter?

Don’t rush to the partial defences before confirming murder is made out — this is a common error that costs marks.

Practise This Topic on Sqewise

Criminal law scenarios in FLK2 require quick, confident application of these rules to complex fact patterns. The best preparation is volume — working through varied practice questions until the framework becomes instinctive. Practise FLK2 criminal law on Sqewise, review your performance on the progress dashboard, and explore the full SQE1 topic list.

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