The Elements of Constructive Manslaughter
There is no mens rea for constructive manslaughter, beyond establishing the mens rea of the relevant unlawful act: DPP v Newbury  AC 500.
Constructive manslaughter is sometimes referred to as ‘unlawful act manslaughter’.
An Unlawful Act
The following principles apply to determining whether there is a relevant unlawful act:
The unlawful act must be unlawful under the criminal law: R v Franklin (1883) 15 Cox CC 163. It must not be an ordinary act done negligently: Andrews v DPP  AC 576.
It must be a crime involving an action, not an crime of omission: R v Lowe  QB 702.
The prosecution must prove all elements of the unlawful act, including mens rea: R v Scarlett  98 Cr App 290; R v Lamb  2 QB 981. There must be no defence: R v Slingsby  Crim LR 570.
There is no need for the unlawful act to be directed at the victim: R v Larkin (1942) 29 Cr App R 18.
In fact, the crime does not need to be directed at a person at all: R v Goodfellow (1986) 83 Cr App R 23.
However, the reasonable person must foresee physical harm, not merely property damage: R v Carey  EWCA Crim 17.
When is the Unlawful Act Dangerous?
An unlawful act is dangerous if a reasonable and sober person would appreciate that the act subjects any person to the risk of some harm (regardless of severity): R v Church  2 WLR 1220. The harm foreseen must be physical or amount to a recognised psychiatric injury: R v Dhaliwal  EWCA Crim 1139.
Because the test is objective, there is no need to show that the defendant foresaw death or any danger: DPP v Newbury  AC 500. The fact that the defendant could not foresee the harm, for example because of his age or mental disability, is irrelevant: R v JF  EWCA 351.
The reasonable person is only aware of circumstances which are objectively apparent from the scene: R v Dawson  81 Cr App R 150. This is true even if the defendant believes something to be the case (mistakenly or otherwise): R v Ball  Crim LR 730.
An unlawful act is not dangerous if the victim or a third-party must make a voluntary, fully-informed action in order to make the defendant’s contribution dangerous: R v Kennedy (No 2)  3 WLR 612.
For example, handing a person a syringe saying it is full of poison is not dangerous. This is because it will not harm anyone unless the victim voluntarily injects it.
This principle could also be viewed as a matter of establishing proper causation. For this reason, if the victim’s actions are a reasonably foreseeable response to the defendant’s unlawful act, the defendant might still be guilty of manslaughter even if the cause of death is suicide: R v Wallace  EWCA Crim 690.
Gross Negligence Manslaughter
The Elements of Gross Negligence Manslaughter
The actus reus of gross negligence manslaughter is established if the defendant breaches a duty of care in a manner which gives rise to an obvious and serious risk of death, is grossly negligent and which caused the death of a human being: R v Rose  EWCA Crim 1168.
There is no subjective mens rea for gross negligence manslaughter: the offence is established purely on the basis of the defendant’s negligence. There is no need for the defendant to personally foresee or intend any harm: R v Singh  Crim LR 582.
Duty and Breach
Any duty of care under the criminal law or tort law will suffice: R v Adomako  3 WLR 288. The question of breach also seems to be determined by reference to the principles of tort law. Whether there is a duty of care is a question for the jury to decide: R v Yaqoob  Crim LR 383. Examples of common situations where duties exist include:
Where the defendant has a position of power or responsibility over a person, for example because they are vulnerable or a family member: R v Reeves  EWCA Crim 2613.
Where the defendant is engaging in a hazardous activity or has contributed to the existence of a dangerous situation that they are aware of: R v Evans  EWCA Crim 650. This duty can arise even if the victim is also responsible for being in danger, such as where they take drugs supplied by the defendant.
Where the defendant has control over a dangerous object: R v S  EWCA Crim 558.
Defences which might negate the existence of a duty in tort may also negate the existence of a duty in this context, such as the defence of illegality.
Obvious and Serious Risk of Death
The relevant duty must give rise to an obvious and serious risk of death if breached: R v Rose  EWCA Crim 1168. It is not sufficient that there was an obvious risk of mere harm (even if serious) – death must be foreseeable: R v Misra & Srivastava  1 Cr App R 328.
- The risk is assessed from the perspective of a reasonable person who knows what the defendant knows: R v Rose  EWCA Crim 1168.
- The jury cannot take into account anything the defendant did not know. For this reason, it is not enough that the situation was ambiguous in a way which would have led a reasonable person to investigate further to rule out the possibility of death: R v Rudling  EWCA Crim 741.
- However, the test is objective so there is no need for the defendant to have subjectively foreseen death: R v S  EWCA Crim 558.
The breach is grossly negligence if it was so bad and shows such disregard for life and safety as to move beyond the realm of civil compensation and into the realm of actions which ought to be criminally punished: R v Bateman (1925) 19 Cr App R 8. This is a high standard, and a question for the jury to decide by reference to all the circumstances. Relevant considerations include:
Whether the defendant subjectively foresaw the risk: Attorney General’s Reference (No 2 of 1999)  Crim LR 475.
The defendant’s experience in fulfilling the duty and level of responsibility in the circumstances: R v Singh  Crim LR 582.
Whether the defendant was subject to any external pressures. Systemic issues with the defendant’s environment are often not considered relevant, however: Bawa-Garba v General Medical Council  EWCA Civ 1879.