Erin Patterson's Appeal: The Legal Fight Over Key Evidence and a Harsher Sentence Bid

Erin Patterson's appeal against her convictions for three counts of murder and one count of attempted murder resumed before the Victorian Court of Appeal on 20 August 2026, with prosecutors responding to defence challenges to critical evidence and the sole surviving lunch guest returning to the courtroom.

Patterson joined the proceedings via video link from the Dame Phyllis Frost Centre, Victoria's maximum security women's prison. She has been in custody since her sentencing in September 2025 to life imprisonment with a non-parole period of 33 years — the earliest date she could be considered for release, set by Justice Christopher Beale of the Supreme Court of Victoria, which would fall in 2056 (ABC News).

The two-day hearing, scheduled for 19 and 20 August at Court 1, 210 William Street, is being publicly livestreamed (Supreme Court of Victoria). Three Victorian judges are hearing seven grounds of appeal — that is, seven distinct legal arguments — advanced by Patterson's legal team against her convictions.

Ian Wilkinson, the only lunch guest to survive the fatal meal, returned to court for day two, accompanied by his daughter Ruth Dubois (The Guardian). Wilkinson's presence is a reminder of the human stakes in a case that has drawn intense public attention since the July 2023 lunch at Patterson's Leongatha home that killed three guests and left Wilkinson critically ill.

At the centre of day two's proceedings was the Crown's response to Patterson's second ground of appeal, which targets two interlocking categories of evidence: mobile phone tower data and death cap mushroom sighting records from the citizen science platform iNaturalist. Patterson's barristers argued that this evidence should not have been admitted at trial because it was either irrelevant or its probative value — its usefulness in proving a fact — was outweighed by unfair prejudice to Patterson (The Guardian).

The phone tower evidence was presented at trial by expert witness Dr Matthew Sorell. The prosecution used it to draw an inference that Patterson could have visited two locations where death cap mushrooms had been sighted and reported on iNaturalist. Crown prosecutor Jeremy McWilliams countered the defence's exclusion argument by maintaining that the phone tower data and the iNaturalist sighting records, considered together, showed Patterson had the opportunity to deliberately source death cap mushrooms before the fatal lunch (The Guardian).

The admissibility question is legally distinct from the question of evidential weight. Patterson's counsel is not merely disputing the reliability of Dr Sorell's phone tower analysis or the accuracy of iNaturalist sightings; they are arguing that the evidence should never have reached the jury at all. If the Court of Appeal agrees that the trial judge erred in admitting it, the conviction could be vulnerable, depending on whether the court finds the error material to the verdict.

The appeal's first day saw Patterson's barrister argue there was a "catastrophic" arrangement during the jury's verdict deliberations, though the substance of that ground has yet to be fully ventilated across the two-day window (YouTube).

The proceedings are not solely about Patterson's convictions. Victoria's Director of Public Prosecutions has filed a cross-appeal against Patterson's sentence, arguing it is manifestly inadequate — meaning the prosecutors consider it unreasonably lenient. Prosecutor Brendan Kissane confirmed that prosecutors will argue Patterson should be sentenced to life imprisonment without possibility of parole, a more severe outcome than the sentence Justice Beale imposed (The Courant).

The dual-track appeal creates a range of possible outcomes. The Court of Appeal could uphold the convictions and the sentence, quash the convictions and order a retrial, allow the conviction appeal and acquit, or dismiss the conviction appeal while granting the Crown's sentence appeal and impose a harsher penalty. Each path carries distinct consequences for a case that has already proceeded through one of Victoria's most closely watched criminal trials.

The broader context here is that the hearing began almost a year after Patterson's sentencing (The Daily Aus). The seven grounds of appeal, taken together, form a comprehensive challenge to the integrity of the trial process, from evidentiary rulings to jury deliberation procedure. Whether any single ground succeeds will depend on the court's assessment of legal error, not on revisiting the factual findings the jury reached. In my view, the cross-appeal from the Crown adds an unusual layer of risk for Patterson: even if her conviction appeal fails, she could still face a harsher sentence, which is a dynamic that conviction appeals do not typically involve.