Il v The Queen

The appellant was tried in the Supreme Court of New South Wales on charges including manufacturing a large commercial quantity of methylamphetamine, murder, and manslaughter. The Crown alleged the appellant participated in a joint criminal enterprise with the deceased to manufacture the drug. Regarding the murder and manslaughter charges, the Crown contended that even if the deceased's death was accidental and self-inflicted, the appellant was guilty because the act causing death occurred during the course of the joint criminal enterprise, an offence punishable by life imprisonment. The trial judge directed the jury to acquit the appellant of these counts, a decision subsequently overturned by the Court of Criminal Appeal, which ordered a new trial. The High Court of Australia was asked to determine whether the trial judge's direction to acquit was correct.

The central legal issues before the High Court were whether section 18(1) of the Crimes Act 1900 (NSW) encompasses self-killing, and whether the principles of joint criminal enterprise liability permit the attribution of the deceased's act causing their own death to the appellant. Specifically, the Court had to consider if the liability of a co-participant in a joint criminal enterprise extends to acts performed by the deceased that result in their own death, particularly when the death occurs in the course of that enterprise.

The High Court, in allowing the appeal, clarified the principles of joint criminal enterprise liability as established in *Osland*. The majority held that joint criminal liability involves the attribution of acts, meaning one person can be held responsible for the actual acts of another. However, this attribution of acts does not extend to attributing liability for the whole or part of a crime, nor does it encompass the attribution of liability for the deceased's self-inflicted act. The Court concluded that the trial judge's direction to acquit the appellant of the murder and manslaughter charges was correct, as the concept of joint criminal enterprise liability does not extend to holding a participant responsible for the self-killing of a co-participant.

Consequently, the High Court allowed the appeal, set aside the orders of the Court of Criminal Appeal, and reinstated the trial judge's direction to dismiss the murder and manslaughter counts.