Mitchell v The King

The High Court of Australia heard appeals from convictions for murder under the *Criminal Law Consolidation Act 1935* (SA). The appellants had agreed to commit criminal trespass, and during the commission of this offence, one or more co-venturers committed an intentional act of violence that caused death. The central dispute concerned whether the appellants could be guilty of murder under section 12A of the Act, which deems a perpetrator of an intentional act of violence during the commission of a major indictable offence guilty of murder, when their initial agreement did not extend to such an act of violence.

The legal issues before the High Court were whether the common law doctrine of extended joint criminal enterprise could operate in conjunction with section 12A to render the appellants guilty of murder. Specifically, the court had to determine if the appellants' foresight of the possibility of a co-venturer committing an intentional act of violence causing death was a necessary element for their conviction under this combined operation of law. This involved considering whether the foundational offence of criminal trespass, which did not involve violence, could serve as the basis for a murder conviction under section 12A when combined with the principles of extended joint criminal enterprise.

The High Court allowed the appeals, quashed the convictions, and ordered new trials. The court reasoned that the trial judge had erred in directing the jury that the appellants could be guilty of murder by reference to section 12A when the foundational crime did not involve an intentional act of violence. The court found that the principles of extended joint criminal enterprise could not be combined with the provisions of section 12A to create a pathway to murder liability in the absence of foresight by the secondary party of the possibility of an intentional act of violence causing death. The court concluded that the jury should have been directed that the appellants must have foreseen that a co-venturer might commit an intentional act of violence that was capable of causing death or really serious bodily harm in the course of the foundational offence.