An Australian appeals court has ruled that Erin Patterson, convicted of murdering three relatives of her estranged husband using poisonous mushrooms, must remain in prison for the rest of her life without the possibility of parole.
The Victoria Court of Appeal rejected Patterson’s challenge to her convictions while accepting prosecutors’ arguments that her original sentence did not adequately reflect the seriousness of the crimes. The decision removes the possibility of her being considered for release after serving a minimum term of 33 years.
Delivering the unanimous judgment on Friday, Justice Stephen McLeish said the offences involved an exceptional level of criminality and were carried out through deliberate and calculated actions. The judges concluded that setting a minimum period before parole eligibility would not be appropriate given the circumstances.
The case relates to a family lunch Patterson hosted at her home in Leongatha, a rural town in Victoria, in July 2023. She served beef Wellington dishes containing death cap mushrooms, resulting in the deaths of her parents-in-law, Don and Gail Patterson, and Gail’s sister, Heather Wilkinson.
Heather’s husband, Ian Wilkinson, also became seriously ill but survived after spending several weeks in hospital. Patterson was convicted of attempting to murder him.
Prosecutors argued during the appeal proceedings in August that the original non-parole period was too lenient. They maintained that the planning and conduct involved warranted a sentence that would keep Patterson imprisoned for life without release.
In its ruling, the court referred to evidence indicating that Patterson’s intention to kill the four guests had continued over a period of nearly three weeks after she invited them to the meal. The judges also considered what they described as a series of misleading statements and attempts to conceal evidence.
According to the judgment, Patterson had falsely referred to a cancer diagnosis as an explanation for why her two children would not attend the lunch. The court also noted that she had destroyed evidence, denied collecting mushrooms and provided false accounts about their origin.
Patterson maintained that the mushrooms had been included in the meal unintentionally. However, a jury found her guilty of the murders and the attempted murder. In September 2025, she received three life sentences for murder and a further 25-year term for attempted murder.
Patterson did not attend the appeal hearing in person and followed the proceedings through a video connection from prison. She is being held in the high-security Gordon Unit at Dame Phyllis Frost Centre in Melbourne, where prisoners considered vulnerable to threats from other inmates are accommodated.
The ruling makes Patterson only the second woman in Australia to receive a life sentence without the possibility of parole. Katherine Knight was the first, receiving such a sentence in 2001 for the murder of her partner, John Price, in New South Wales.
Patterson retains the option of seeking leave to appeal to Australia’s High Court, which represents her final avenue for challenging the convictions or sentence.
The case attracted extensive international attention and has since generated books, podcasts and screen projects. Actor Melanie Lynskey has also announced plans to portray Patterson in a six-part Paramount+ drama based on the events leading to her arrest.
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