Australia Mushroom Killer's Lawyers Argue Jury Irregularities in Appeal

Lawyers for Erin Patterson, convicted in a high-profile triple-murder case, are seeking to overturn her conviction, citing irregularities in the jury's sequestration during her trial. Patterson, 51, was found guilty in 2025 of murdering her husband's parents and an elderly aunt in 2023 by serving them a beef Wellington dish contaminated with death cap mushrooms.

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Fundamental failure

Her legal team argued before the Court of Appeal that the jury's stay at the same hotel as a witness and members of the prosecution constituted a "fundamental failure" of the legal process. While acknowledging no evidence of direct communication, they contended this arrangement undermined the trial's fairness. Patterson watched the appeal proceedings via video link from a maximum-security prison.

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in perhaps one of the most high-profile criminal trials this state has ever had

Additionally, Patterson's lawyers challenged the admissibility of certain evidence, including cell tower data and mushroom sighting posts, deeming it unreliable. They also argued that other crucial evidence, such as images of mushrooms found on a memory card, was wrongly excluded. These issues, they claim, led to a "substantial miscarriage of justice."

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arises to the level of a substantial miscarriage of justice

Meanwhile, the prosecution has filed its own appeal, arguing that the 33-year minimum sentence imposed by the judge was "manifestly inadequate." They contend the judge erred in considering the likelihood of Patterson facing prolonged solitary confinement, which they believe improperly influenced the sentencing decision. The appeals are being heard by three judges over two days.

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manifestly inadequate