Katsuno v The Queen

The High Court of Australia considered an appeal by the applicant, Katsuno, against his conviction for murder. The applicant had been found guilty of murder by a jury in the Supreme Court of New South Wales and subsequently appealed to the Court of Criminal Appeal of New South Wales, which dismissed his appeal. The High Court granted special leave to appeal from the decision of the Court of Criminal Appeal.

The central legal issue before the High Court was whether the trial judge had erred in law by failing to direct the jury adequately on the defence of provocation. Specifically, the court had to determine if the evidence presented at trial was capable of supporting a finding that the applicant had acted under provocation, and if so, whether the jury had been properly instructed on the elements of this defence, including the requirement that the provocation must be such as to make an ordinary person lose self-control.

Gummow and Kirby JJ, in their joint judgment, analysed the evidence relating to the events preceding the killing. They considered the nature of the deceased's conduct towards the applicant and whether this conduct could reasonably be seen as constituting a legal provocation. The Court reiterated the established principles of provocation as a partial defence to murder, emphasising that it requires an intentional act or series of acts on the part of the deceased, done in the presence of the accused, which would cause an ordinary person to lose self-control, and which did, in fact, cause the accused to lose self-control and kill the deceased. The judges concluded that the evidence did not, as a matter of law, support a finding of provocation, and therefore, the trial judge was not obliged to leave that defence to the jury.

The High Court dismissed the appeal, upholding the applicant's conviction for murder.