MELBOURNE — Erin Patterson has returned to court to challenge her convictions for murdering three members of her estranged husband’s family in a case that became one of Australia’s most closely followed criminal trials.
Patterson, 51, began her appeal before Victoria’s Court of Appeal on Wednesday, August 19, seeking to overturn three murder convictions and one attempted-murder conviction stemming from a fatal July 2023 lunch at her home in Leongatha, Victoria.
At the same time, prosecutors are pursuing their own appeal, arguing that Patterson’s sentence was too lenient and asking the court to consider a punishment that would leave her with no possibility of parole.
The deadly mushroom lunch
The case centers on a lunch Patterson hosted in July 2023 for her former in-laws, Don and Gail Patterson, and Gail’s sister Heather Wilkinson and her husband, Ian Wilkinson.
The guests became critically ill after eating a meal that included individual beef Wellingtons. Don, Gail and Heather later died, while Ian survived after spending weeks in hospital.
Prosecutors alleged that Patterson deliberately served the guests food containing death cap mushrooms, one of the world’s most poisonous mushroom species.
Patterson has maintained that the poisoning was accidental and has denied deliberately killing her relatives. Her conviction in July 2025 followed an 11-week trial in Morwell, Victoria.
Life sentence — but parole remains possible
In September 2025, Supreme Court Justice Christopher Beale sentenced Patterson to life imprisonment with a 33-year non-parole period for the murders.
She also received a 25-year sentence for the attempted murder of Ian Wilkinson, with the sentences running concurrently.
Because of the 33-year non-parole period and time already served, Patterson could potentially become eligible for release in 2056, when she would be in her early 80s.
The prosecution, however, argues that the sentence does not adequately reflect the seriousness of the crimes and is seeking a harsher outcome, potentially removing the prospect of parole altogether.
Patterson raises seven grounds of appeal
Patterson’s legal team is challenging the integrity of the original trial on several grounds.
Among the issues raised are allegations concerning the sequestration of the jury, with her lawyers arguing that jurors being housed at the same hotel as a police witness and members of the prosecution team created a serious irregularity that undermined the verdicts.
Her lawyers are also challenging the admission or treatment of evidence involving:
- mobile phone tower data;
- reported sightings of death cap mushrooms;
- social-media evidence;
- evidence involving Patterson’s alleged mushroom-foraging history; and
- the prosecution’s cross-examination and closing arguments.
The defense has argued that the prosecution’s approach during the trial caused a substantial miscarriage of justice and that certain evidence unfairly prejudiced the jury.
Patterson is not attending the appeal hearing in person. She is following the proceedings by video link from prison. Three judges — Justices Stephen McLeish, Lesley Taylor and Peter Kidd — are hearing the appeal.
What happens if Patterson wins?
The appeal does not automatically mean Patterson will walk free.
The Court of Appeal must first consider whether to grant leave to appeal. Even if leave is granted, the judges could ultimately reject the appeal.
If the convictions are overturned, possible outcomes could include an acquittal or a retrial, depending on the court’s findings.
The two-day hearing is therefore a major legal test for both sides: Patterson is attempting to dismantle the convictions that have kept her behind bars, while prosecutors are simultaneously trying to make her existing life sentence even more severe.
For now, Patterson remains convicted and imprisoned, and no final decision on either appeal has been announced.
The case continues to attract international attention because of the unusual circumstances surrounding the poisoning, the high-profile trial and the legal questions now being examined by Victoria’s highest appellate court.
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