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What is murder, and how do the partial defences reduce it to voluntary manslaughter?

Murder and voluntary manslaughter: the actus reus and mens rea of murder, and the partial defences of loss of control and diminished responsibility under the Coroners and Justice Act 2009 that reduce murder to voluntary manslaughter.

An Eduqas A-Level Law guide to murder and voluntary manslaughter. Explains the actus reus and mens rea of murder and the partial defences of loss of control and diminished responsibility, with worked scenario answers and the AO2 application the paper rewards.

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What this dot point is asking

Eduqas criminal law requires you to know murder (its actus reus and mens rea) and the two partial defences that reduce it to voluntary manslaughter: loss of control and diminished responsibility under the Coroners and Justice Act 2009. The skill is to establish murder and then apply a partial defence to a scenario (AO2), and to evaluate the defences (AO3).

The answer

Murder

Loss of control

The mandatory life sentence makes the partial defences crucial; each reduces murder to voluntary manslaughter. Loss of control is governed by sections 54 to 55 of the Coroners and Justice Act 2009, which replaced the old defence of provocation.

Diminished responsibility

Diminished responsibility is governed by section 52 of the Coroners and Justice Act 2009 (which amended s2 of the Homicide Act 1957). The defendant must show an abnormality of mental functioning that (a) arose from a recognised medical condition (such as depression, Gittens; alcohol dependency syndrome, Wood), (b) substantially impaired the defendant's ability to understand the nature of the conduct, form a rational judgement or exercise self-control ("substantially" means important or weighty, not total, Golds), and (c) provides an explanation for the killing (it was a significant contributory cause). The defendant bears the burden on the balance of probabilities. Where the defendant was voluntarily intoxicated, the jury considers the underlying condition apart from the drink (Dowds).

Examples in context

A strong answer establishes murder first, then applies the partial defence element by element.

Try this

Q1. Explain the mens rea of murder. [10 marks]

  • What the marker wants. Precise AO1: malice aforethought, the intention to kill or to cause grievous bodily harm (Vickers; Cunningham), and that intention may be direct (Mohan) or oblique (a virtual certainty appreciated by the defendant, Woollin).

Q2. Sam, who has severe depression diagnosed by doctors, kills his brother during a psychotic episode. Advise on whether Sam can rely on diminished responsibility. [20 marks]

  • Cue. An AO2 application: murder is established; under s52 Coroners and Justice Act 2009, depression is a recognised medical condition causing an abnormality of mental functioning that may substantially impair Sam's ability to form a rational judgement or exercise self-control (Golds) and explain the killing, reducing murder to voluntary manslaughter.

Exam-style practice questions

Practice questions written in the style of WJEC Eduqas exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

Eduqas Component 2 2022 (scenario)20 marksAfter years of abuse, Priya finally snaps when her partner taunts her, and she kills him with a kitchen knife. Advise on whether Priya can rely on the partial defence of loss of control. [a scenario in the style of Component 2; the real paper tariff is 25, AO1 and AO2]
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A mainly AO2 scenario on loss of control.

Murder first. Priya has the actus reus (unlawful killing) and mens rea (intent to kill or cause GBH, Vickers), so murder is established unless a partial defence applies.

Loss of control (ss54 to 55 Coroners and Justice Act 2009). Three requirements: (1) a loss of self-control (need not be sudden, s54(2)); (2) a qualifying trigger, the fear trigger (fear of serious violence) or the anger trigger (things said or done of an extremely grave character giving a justifiable sense of being seriously wronged, s55); and (3) a person of D's sex and age with a normal degree of tolerance and self-restraint might have reacted similarly. Years of abuse plus a grave taunt may amount to a qualifying trigger (compulsive cases such as those following Ahluwalia and now within the cumulative-impact approach); sexual infidelity alone is excluded (s55(6)(c), but context counts, Clinton). If satisfied, murder is reduced to voluntary manslaughter.

A top answer runs the three statutory requirements on the facts and concludes on whether murder is reduced.

Eduqas Component 3 2021 (essay)20 marksAnalyse and evaluate the partial defence of diminished responsibility. [an essay in the style of Component 3; the real paper tariff is 25, AO1 and AO3]
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A mainly AO3 essay. Explain the defence, then evaluate the 2009 reforms.

The law. Section 52 of the Coroners and Justice Act 2009 (amending the Homicide Act 1957) requires an abnormality of mental functioning, arising from a recognised medical condition, that substantially impaired D's ability to understand the nature of the conduct, form a rational judgement or exercise self-control, and that provides an explanation for the killing (Golds on substantially; intoxication issues in Dowds and Joya/Kay-type cases).

Evaluation. Strengths: the 2009 wording is clearer and tied to medical evidence ('recognised medical condition'); it fairly distinguishes the mentally ill from cold-blooded killers. Weaknesses: 'substantially impaired' is still a question of degree for the jury (Golds); the relationship with intoxication and alcohol dependency syndrome is complex (Wood; Dowds); and the burden is on the defendant, which some say conflicts with the presumption of innocence.

A top answer explains the elements and evaluates the clarity and fairness of the reformed defence, then concludes.

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