An Australian appeals court has ordered convicted triple murderer Erin Patterson to spend the rest of her life in prison without the possibility of parole over the fatal mushroom poisoning of three relatives of her estranged husband.
The Victoria Court of Appeal on Friday, October 30, dismissed Patterson’s appeal against her convictions while allowing prosecutors’ challenge to her original 33-year non-parole sentence.
The ruling means the 51-year-old will never be eligible for release, following what judges described as the exceptionally shocking nature of her crimes.
Delivering the unanimous decision, Justice Stephen McLeish said Patterson’s actions were carefully planned and demonstrated an extraordinary level of deception.
“This offending was extraordinarily cold and calculated and stands to be denounced in the strongest terms,” McLeish said.
“In all the circumstances, after anxious consideration, we have concluded that the case involved such shocking criminality that it is inappropriate to fix a non-parole period.”
Patterson was convicted of murdering her parents-in-law, Don and Gail Patterson, and Gail’s sister, Heather Wilkinson, after serving them a beef Wellington meal containing poisonous death cap mushrooms at her home in Leongatha, Victoria, in July 2023.
Heather’s husband, Ian Wilkinson, survived the meal after spending several weeks in hospital. Patterson was convicted of his attempted murder.
Prosecutors had argued during an appeal hearing in August that her original sentence was too lenient, insisting that the calculated nature of the killings warranted life imprisonment without the possibility of parole.
Justice McLeish said Patterson’s intention to murder all four victims had been sustained for almost three weeks after she invited them to the family lunch.
The court also highlighted what it described as an elaborate series of deceptions, including Patterson’s false claims about having cancer to explain the absence of her two children from the gathering.
The judges further noted that she destroyed evidence, denied foraging for mushrooms and repeatedly provided false explanations about where the poisonous mushrooms had come from.
Patterson, however, maintained that the mushrooms had accidentally found their way into the meal.
She was initially sentenced in September 2025 to three life sentences for murder and 25 years’ imprisonment for the attempted murder of Ian Wilkinson, with a 33-year non-parole period.
The latest ruling makes her only the second woman in Australian history to receive life imprisonment without the possibility of parole.
The first was Katherine Knight, who was sentenced in New South Wales in 2001 for murdering her partner, John Price, in 2000.
Patterson did not physically attend Friday’s court proceedings and instead followed the ruling through a video link from prison.
She is being held in the high-security Gordon Unit at Melbourne’s Dame Phyllis Frost Centre women’s prison because of concerns about her safety among other inmates.
Despite the latest decision, Patterson retains the option of approaching Australia’s High Court in a final attempt to challenge her convictions and sentence.
The case attracted international attention and has since inspired podcasts, books and screen adaptations.
Emmy-nominated actor Melanie Lynskey recently announced that she will portray Patterson in a six-episode Paramount+ series documenting the 97 days between the fatal family lunch and Patterson’s arrest. Lynskey will also serve as an executive producer.
Patterson’s estranged husband, Simon Patterson, had been invited to the lunch but declined the invitation the day before.
During pretrial proceedings, he testified that he had turned down the invitation because he feared for his safety, with evidence also emerging of his suspicions that Erin had previously attempted to kill him.
