Erin Patterson began the day with hope. Now Australia’s mushroom murderer knows she’s likely to die in jail

Victoria’s Court of Appeal rejected Patterson’s challenge to her convictions. Justice Stephen McLeish said the court dismissed all seven grounds, including the final two for which it granted leave to appeal. The murder and attempted-murder convictions therefore remained in place.

The court also accepted the director of public prosecutions’ argument that the sentence was too lenient. It did not merely extend the 33-year non-parole period. It found that fixing any non-parole period was inappropriate because of the crimes’ nature.

That means Patterson should have no prospect of release on parole. McLeish described the offending as carefully planned, deliberate, cold and calculated. Patterson has 28 days to seek leave to appeal to the High Court. A fresh Court of Appeal hearing remains possible only if new and compelling evidence emerges, which the article describes as a rarely cleared hurdle.

Three people died: Don Patterson, Gail Patterson and Heather Wilkinson. They became ill after eating individual beef wellingtons served at Patterson’s lunch. Patterson was convicted of murdering them.

Heather’s husband, Ian Wilkinson, also ate the meal and was the only survivor among the four diners. He suffered severe illness and spent weeks in hospital before surviving. Patterson was convicted of his attempted murder rather than his murder.

The outcome shaped both the conviction and the appeal. The Court of Appeal upheld the three murder convictions and the attempted-murder conviction. It also accepted that the offending involved sustained intent toward all four people, from the invitations through the meal and the victims’ suffering. The court relied on that overall pattern when deciding that no non-parole period should be fixed.

A non-parole period sets the minimum time a person sentenced to imprisonment must serve before applying for parole. Parole is conditional release under supervision, not an automatic entitlement. Eligibility does not guarantee that release will occur.

Patterson had originally received life imprisonment with a 33-year non-parole period. That meant she could apply for parole after serving 33 years, subject to the relevant decision-making process. The Court of Appeal found that period manifestly inadequate.

The appeal court instead held that fixing any non-parole period was inappropriate. In practical terms, its decision removed the prospect of parole under the sentence. The ruling matters because it changes the sentence from a possible future parole application to imprisonment with no parole pathway. Patterson may still seek High Court leave within 28 days, according to the article.

A convicted person is not the only party who may challenge a criminal sentence. In systems such as Victoria’s, prosecution authorities can appeal when they argue that a sentence is unlawfully lenient or contains a serious sentencing error. This helps appellate courts correct sentences that do not properly reflect the offending.

That power is separate from challenging the conviction itself. Patterson appealed against her convictions, while the director of public prosecutions appealed the 33-year non-parole period. The DPP argued that the punishment did not adequately reflect the seriousness of the murders and attempted murder.

The Court of Appeal agreed with the prosecution. Justice McLeish said the issue was not simply that 33 years was too short. Given the carefully planned offending and sustained intent, the court found that any fixed non-parole period was inappropriate. The sentence was therefore resentenced to remove any prospect of parole.

Death cap mushrooms are highly poisonous fungi. They contain amatoxins, especially alpha-amanitin, which can cause fatal poisoning. The article identifies death caps as the alleged source of the meal’s poison, but it does not explain their biology; these medical details come from established toxicology.

After ingestion, amatoxins can cause delayed gastrointestinal illness before severe organ injury becomes clear. They inhibit RNA polymerase II, an enzyme cells need to make proteins. Without that process, cells in the liver and other organs cannot maintain normal function. Damage can progress to liver failure, kidney injury and death.

The delay can make the poisoning difficult to recognise early. In Patterson’s case, all four diners became unwell, three died, and Ian Wilkinson survived after weeks in hospital. The court heard Patterson denied foraging mushrooms and suggested Asian grocers as possible sources, while maintaining the contamination was accidental.

A criminal conviction or sentence may be appealed when the trial involved a legal error, a serious procedural problem, an unreasonable verdict, or another recognised ground. A sentence may also be challenged if the judge applied the law incorrectly or imposed a punishment that was plainly inadequate or excessive.

Fresh evidence is different because it was not properly available or used at trial. A court generally asks whether it is credible, genuinely new, and capable of affecting the verdict or sentence. Evidence that merely repeats known material, raises a weak possibility, or could have been presented earlier may not qualify.

The high threshold protects both fairness and finality. Reopening every completed case would make verdicts unstable and burden courts. The article says Patterson could seek a fresh Court of Appeal hearing if fresh and compelling evidence emerges, but adds that this bar is rarely cleared. It does not identify any such evidence now.

Sentencing serves several purposes: holding offenders accountable, expressing society’s condemnation, protecting the community, deterring crime, and recognising victims’ harm. Life imprisonment is reserved for the most serious offending and signals that the crime warrants the strongest punishment available.

Parole creates a controlled route from prison back into the community. A prisoner may be released only after meeting legal requirements and complying with conditions. A non-parole period sets the earliest point for consideration. In Patterson’s case, the original sentence allowed a possible application after 33 years.

The Court of Appeal decided that possibility was inappropriate. Justice McLeish emphasised the sustained intent, elaborate deceptions, and suffering and deaths involved. The court therefore resentenced Patterson so that she has no prospect of parole. She can seek High Court leave within 28 days, but the article says her conviction appeal was dismissed and offers no indication that the result will change.