Australian mushroom killer, Erin Patterson, is set to appeal her conviction on August 19 in a high-profile triple-murder case that drew international attention.
The 51-year-old was convicted in 2025 of murdering her former husband’s parents and an elderly relative after serving them a beef Wellington meal containing deadly death cap mushrooms in 2023.
Patterson was also found guilty of attempting to murder her former husband’s uncle, a local pastor who survived after becoming seriously ill and spending weeks in hospital following the meal.
A judge sentenced Patterson to life in prison, with the possibility of parole after she has served 33 years.
The Court of Appeal in Melbourne will hear two appeals over two days — Patterson’s bid to have her convictions overturned and a prosecution appeal seeking a longer minimum period before she can be considered for parole.
Patterson has applied to follow the proceedings through a live video connection from Dame Phyllis Frost Centre, the maximum-security prison in Melbourne’s western suburbs where she is being held.
Her legal team argues that she suffered several instances of “substantial miscarriage of justice”, alleging that the trial judge made errors when determining which evidence could be placed before the jury.
According to her lawyer, evidence involving Facebook messages, mobile phone cell towers and reports of death cap mushroom sightings was either irrelevant or unfairly prejudicial to Patterson’s defence.
The lawyer also argued that evidence concerning mushroom photographs found on a memory card at Patterson’s home should not have been excluded, according to an appeal submission filed in November 2025.
Her legal team further alleged that a “fundamental irregularity” occurred while the jury was sequestered, which it said “fatally undermined the integrity of the verdicts”. No further details were provided in the submission.
Patterson’s solicitor also accused prosecutors of conducting an “unfair and oppressive” cross-examination during the trial.
Before considering the substantive arguments, the Court of Appeal judges will first determine whether Patterson has established sufficient grounds to obtain permission to challenge her convictions.
Meanwhile, prosecutors have challenged the sentence handed to Patterson, arguing that the 33-year non-parole period set by the sentencing judge was “manifestly inadequate”.
The prosecution contends that the judge wrongly concluded there was a substantial possibility Patterson would spend years in solitary confinement, arguing that the finding “infected” his sentencing decision.
A 12-member jury convicted Patterson in July 2025 of killing her former husband Simon’s parents, Don and Gail Patterson, along with his aunt, Heather Wilkinson, during a lunch at her home in the Victorian farming town of Leongatha.
She was also convicted of attempting to kill Heather Wilkinson’s husband, Ian, a pastor who became critically ill after the meal but ultimately survived.
