SL v The Queen

The High Court of Australia heard an appeal by SL against a conviction for murder. The appellant had been found guilty 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 the appeal. The central dispute concerned the admissibility of certain evidence and the fairness of the trial process.

The High Court was required to determine whether the trial judge erred in admitting evidence of the appellant's prior convictions and whether the summing up to the jury was adequate, particularly in relation to the issue of self-defence. A further issue was whether the cumulative effect of any errors rendered the trial unfair.

The Court held that the admission of evidence of prior convictions was prejudicial and should not have been admitted. Gleeson CJ and Heydon J found that the judge's directions to the jury regarding this evidence were insufficient to mitigate its prejudicial effect. Furthermore, the Court concluded that the summing up on self-defence was inadequate, failing to properly explain the relevant legal principles to the jury. The cumulative impact of these errors meant that the conviction could not stand.

The High Court allowed the appeal, quashed the conviction, and ordered a new trial.