Erin Trudi Patterson

Background and the fatal lunch

Erin Patterson grew up in Glen Waverley, in Melbourne’s south-eastern suburbs. Before the case, her background included university study and training as an air traffic controller. She and her estranged husband, Simon Patterson, had two children. Although their marriage had broken down, the family connections brought Simon’s parents and other relatives into her life.

On 29 July 2023, Patterson hosted lunch at her home in Leongatha for Don and Gail Patterson and Heather and Ian Wilkinson. Simon had also been invited but declined to attend. The children were away at the cinema. Patterson served individual beef Wellingtons containing poisonous death cap mushrooms. The four guests became critically ill; Patterson did not develop the severe poisoning suffered by her guests.

The gathering involved a fabricated claim that Patterson had cancer or might require cancer treatment. The prosecution argued that the medical story helped create the circumstances for the lunch. At sentencing, Justice Christopher Beale treated the false medical pretext, together with the preparation of the poisonous mushrooms, as evidence of planning.

All four guests were admitted to hospital following the meal. Gail Patterson and Heather Wilkinson died on 4 August, and Don Patterson died the following day. Their illnesses involved severe liver dysfunction and multiple-organ failure. Ian Wilkinson survived after a prolonged hospital admission, returning home in September 2023. His recovery left him facing both the effects of the poisoning and the loss of Heather, his wife.

Investigation and evidence

The investigation examined the food, Patterson’s accounts of its ingredients, her electronic devices and her conduct after the lunch. Chemical analysis detected a toxin associated with death cap mushrooms in discarded beef Wellington remnants, even though a visual examination had not identified recognisable death cap material. Investigators also recovered photographs of mushrooms from her tablet; an expert identified mushrooms shown on scales as death caps with a high degree of confidence. These findings became part of the prosecution’s case that the poisoning was deliberate.

A food dehydrator became another significant exhibit. CCTV showed Patterson disposing of it at the Koonwarra Transfer Station on 2 August 2023, while her guests were still in hospital. Police recovered the appliance, and the prosecution presented evidence linking it to death cap mushrooms. The timing of its disposal was relied upon as evidence that she was trying to conceal what had happened.

Patterson initially said the mushrooms had come from commercial suppliers. Her account changed to allow for the possibility that mushrooms she had foraged were accidentally mixed into the meal. She acknowledged lying about foraging and owning the dehydrator, but maintained that she had not knowingly poisoned anyone. Her explanation for disposing of the appliance and resetting a phone was that she panicked and feared losing her children.

Arrest, trial and verdict

Police arrested Patterson at her Leongatha home on 2 November 2023. She was initially charged with three murders and five attempted murders. The eventual trial concerned the murders of Don and Gail Patterson and Heather Wilkinson, and the attempted murder of Ian Wilkinson. Separate attempted-murder charges involving Simon Patterson were discontinued before trial and did not result in convictions. Those allegations are therefore excluded from the offence years and victim count in this entry.

Her Supreme Court of Victoria trial began in Morwell on 29 April 2025, before Justice Beale. Patterson pleaded not guilty. The central dispute was whether the deaths and illness resulted from an accident or an intentional poisoning. Prosecutors relied on the combined food, digital and witness evidence, alongside her false accounts and disposal of evidence. The defence argued that dishonesty and panic did not establish murderous intent. After hearing the case, the jury unanimously found her guilty of all three murders and the attempted murder on 7 July 2025.

Sentence and motive

On 8 September 2025, Patterson received three life sentences for murder and a 25-year sentence for attempted murder, to run concurrently. The court set a non-parole period of 33 years. With her pre-sentence detention credited, she would become eligible to seek parole in 2056 under that sentence. Eligibility would not guarantee release. The judge took account of the unusually restrictive custody conditions she had experienced and was expected to continue facing because of her notoriety.

Justice Beale emphasised the planning, the victims’ suffering, the concealment of evidence and the betrayal of relatives who had supported Patterson and her children. He also found no evidence of remorse. However, the court did not establish a specific motive. The judge expressly declined to speculate about why she committed the crimes.

Appeals and current position

Patterson challenged her convictions, while the Director of Public Prosecutions challenged the sentence, seeking to remove the possibility of parole or increase the minimum term. Arguments at the August 2026 hearings included the admission of mushroom photographs and the fact that jurors had stayed in the same hotel as some prosecution personnel during deliberations. Her lawyers argued that problems in the trial amounted to a miscarriage of justice; the prosecution disputed those claims.

The Court of Appeal heard the matters on 19 and 20 August 2026 and reserved judgment. As checked on 9 September 2026, the court’s published update still said that its decision would be delivered later. Patterson’s convictions and existing sentence therefore remained in place pending the outcome.

Timeline

• 29 July 2023: Patterson serves the poisoned lunch to four relatives at her Leongatha home.
• 30 July 2023: The four guests are hospitalised after becoming ill.
• 2 August 2023: CCTV records Patterson disposing of the food dehydrator at Koonwarra.
• 4 August 2023: Heather Wilkinson and Gail Patterson die.
• 5 August 2023: Don Patterson dies. Police search Patterson’s home.
• September 2023: Ian Wilkinson is discharged after almost two months in hospital.
• 2 November 2023: Patterson is arrested and charged.
• 29 April 2025: Her Supreme Court trial begins in Morwell.
• 7 July 2025: The jury finds her guilty of three murders and one attempted murder.
• 8 September 2025: She receives life imprisonment with a 33-year non-parole period.
• 19–20 August 2026: The Court of Appeal hears the conviction and sentence challenges and reserves judgment.
• 9 September 2026: Status checked: the court’s published update continues to list judgment as pending.