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Manslaughter in English law

Crime in England and Wales

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  • 6 chapters

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Voluntary manslaughter

Voluntary manslaughter occurs when the defendant kills with mens rea (an intention to kill or cause grievous bodily harm), but one of those partial defences which reduce murder to manslaughter applies (these consist of mitigating circumstances which reduce the defendant's culpability). The original mitigating factors were provocation and chance medley which existed at common law, but the former has been abolished by statute, the latter has been held no longer to exist and new defences have been created by statute.

The Homicide Act 1957 now provides two defences which may be raised to allow the court to find the accused guilty of voluntary manslaughter: diminished responsibility and suicide pact. The Coroners and Justice Act 2009 creates the defence of "loss of control".

Diminished responsibility

Under section 2 of the Homicide Act 1957 there are three requirements for the defendant to raise the defence of diminished responsibility. The defendant must have suffered from an abnormality of mind at the time of the killing caused by one of the causes specified by the Act which substantially impaired the defendant's mental responsibility for the killing. Under section 2(2) of the Act it is for the defendant to prove he suffered from such a condition on the balance of probabilities.

Abnormality of mind

An abnormality of mind has been defined by Lord Parker CJ "as state of mind so different from that of ordinary human beings that the reasonable man would term it abnormal". In deciding whether this state of mind exists the jury should consider medical evidence, but also all other evidence including acts and statements of the accused and his demeanour. The jury does not have to accept the medical evidence if other material conflicts with and outweighs it.

Specified causes

The Homicide Act specifies three causes one of which must cause the abnormality; they are a condition of arrested or retarded development of mind, any inherent cause or a disease or injury. Whether the abnormality is caused by one of the specified causes is a matter for medical evidence alone. Alcoholism is capable of being an abnormality of mind even if there is no physical damage to the brain.

Substantial impairment of mental responsibility

Whether the abnormality substantially impaired the defendant's mental responsibility for the killing is a question of degree for the jury. In R v Lloyd the Court of Appeal held that the lack of control must simply be ‘more than trivial’.

Premenstrual tension (PMT) has been accepted as a mitigating factor in several high-profile cases. In 1980, Sandie Smith was convicted of manslaughter for stabbing a barmaid. Dr. Katharina Dalton who examined Smith before the trial diagnosed her with severe PMS. This diagnosis was accepted as a cause of diminished responsibility. Smith was sentenced to three years probation despite previous convictions for violent behaviour.

Loss of control

Loss of control is a partial defence to murder introduced by the Coroners and Justice Act 2009. It replaced the previous defence of provocation.

Suicide pacts

Section 4(1) of the Homicide Act 1957 introduced the defence of suicide pact. Parliament's intention was to show some compassion for those who had been involved in a suicide pact but failed to die. Section 4(3) defines a suicide pact as "a common agreement between two or more persons having for its object the death of all of them, whether or not each is to take his own life". Further the accused must have had a "settled intention of dying in pursuance of the pact" to avoid the accused entering into a supposed pact with the real intention of committing murder. The Law Commission has proposed abolishing the defence with deserving cases falling within diminished responsibility, but feels it should be retained pending a review of a new partial defence of mercy killings.

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