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What is involuntary manslaughter?

Involuntary manslaughter is when an unlawful act causes death, or when a death is caused by an act of gross (criminal) negligence.  Manslaughter which occurs following the commission of an unlawful act is also known as constructive manslaughter.

Constructive manslaughter

Constructive manslaughter has three elements, namely:

  1. An unlawful act committed by the defendant which results in the death of another person

  2. The act must have involved a risk that someone would be harmed

  3. The defendant must have had the mens rea for the unlawful act which led to the victim’s death

Unlawful act committed by the defendant which causes the death of another person

Much of the case law in this area has involved drug users and people assisting them with taking drugs, though there have been instances before the courts where drug dealers have not been liable for deaths caused by the drugs they have supplied (see, for example, R v Dalby [1982]).  An important point to consider is the chain of causation between the unlawful act and the subsequent death.  Liability will likely be established if there is little or no break in this chain.  In R v Kennedy [1999] the victim had asked the defendant to get him something to help him sleep.  The defendant gave the victim a syringe of heroin.  The victim injected himself with the heroin and was dead within the hour.  The defendant was convicted of manslaughter.  The case can be compared with R v Rogers (Stephen) [2003] where the defendant held a tourniquet around the victim’s arm so that the victim could inject themselves.  The Court of Appeal upheld the defendant’s conviction for manslaughter stating that the defendant had been sufficiently involved in the injection to make him guilty of manslaughter when the victim later died.  The Court of Appeal did question the Kennedy decision when considering the Rogers case, but did not overrule it.    

The act must have involved a risk that somebody would be harmed

An objective test is used to determine the risk.  In other words, would a reasonable and sober person who is watching the act identify a risk?  Additionally, the harm caused must be physical, which includes shock.  Psychological or emotional harm is insufficient.  The case law has established that there must be an unlawful act that was dangerous in the sense that a reasonable and sober person would recognise that the act was enough to put the victim at risk of physical harm.  In R v Carey, C and F [2006] it was held that when deciding whether an act is dangerous, knowledge of the victim’s nature could be relevant.  A reasonable and sober person, unaware that an apparently healthy teenage girl in reality had a congenital heart defect, would probably not reach the conclusion that an unlawful act which amounts to an affray would result in the girl’s death from heart problems. 

The defendant must have had the mens rea for the unlawful act which led to the victim’s death

In R v Lamb [1967] the defendant, as a joke, pointed a loaded gun at his friend.  He did not intend to frighten his friend, and his friend was not, in fact, frightened, as there was no bullet in the firing chamber.  The defendant pulled the trigger, with no intention of harming his friend.  Unfortunately, not understanding how a revolver works, upon pulling the trigger the barrel rotated, moving a bullet into the firing chamber which was subsequently discharged.  The friend was shot and killed.  The defendant was not guilty of manslaughter as he did not have the relevant mens rea, in this case for the unlawful act of assault.

Manslaughter by gross negligence

Negligence is generally defined as a lack of due care, but causing death by a lack of due care is not necessarily manslaughter.  A very high degree of negligence is required, and it is a question for the jury to determine whether the negligence is enough to warrant a conviction for manslaughter.  The appropriate test in manslaughter cases involving a breach of duty, according to the House of Lords in R v Adomako [1994], is if the jury is directed and finds that the defendant was in breach of a duty of care towards the victim, that the breach of duty caused the death, and that the breach of duty could be characterised as gross negligence and consequently a crime.  Lord Mackay LC stated that this would ‘depend on the seriousness of the breach of duty committed by the defendant in all the circumstances in which the defendant was placed when it occurred.  The jury will have to consider whether the extent to which the defendant’s conduct departed from the proper standard of care incumbent on him, involving as it must have done a risk of death…was such that it should be judged criminal.’  

The reasoning in Adomako has been criticised as being circular, that is, that it amounts to a direction that the jury must find a defendant guilty of a crime if they find that he is guilty of a crime, and was challenged in R v Misra [2005] with reference to human rights legislation and the impossibility of obeying an uncertain law.  Nevertheless, the Court of Appeal upheld Adomoko.  Death had occurred from a negligent breach of duty.  The negligent breach of duty had exposed the victim to the risk of death and the circumstances were such that this amounted to gross negligence.

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