Astbury v The Queen

The case of Astbury v The Queen involved the appellant, Astbury, who had been convicted of murder in the Supreme Court of Victoria. Astbury appealed against his conviction, contending that his conviction was unsafe and unsatisfactory due to a significant departure in the prosecutor's final address from the prosecution opening and the evidence presented. The central issue in this appeal was whether the prosecutor’s closing argument introduced a new theory of the case that was not supported by the evidence and whether this constituted a miscarriage of justice.

The court examined the prosecutor's final address to determine whether it introduced a new theory that was not foreshadowed in the prosecution opening or put to the appellant in cross-examination. The court noted that the prosecutor's closing address suggested the death was caused by the appellant jumping on the victim's chest, a proposition that was neither foreshadowed in the opening nor put to the appellant during cross-examination. The court held that this constituted a significant departure from the prosecution's case, breaching the rule established in Browne v Dunn. Furthermore, the court found that the proposition in the closing address regarding the method of inflicting fatal injuries was not supported by the evidence.

In light of these findings, the court concluded that the evidence as a whole did not allow an inference of murderous intent at the time the fatal injuries were inflicted. Consequently, the court allowed the appeal, quashed the conviction of murder, and substituted it with a conviction of manslaughter, consistent with the principles set out in R v Tangye and Tran v The Queen. The decision underscores the importance of maintaining consistency in the presentation of the prosecution's case and the necessity for a conviction to be supported by evidence that allows for a reasonable inference of the requisite intent.