MELBOURNE, Australia – Prosecutors have formally urged an Australian appellate court to impose a permanent life sentence without any possibility of parole on Erin Patterson, the 51-year-old woman convicted of murdering three of her estranged husband’s relatives using toxic death cap mushrooms at a 2023 homemade lunch. The arguments were delivered Thursday to a three-judge panel of the Victoria Court of Appeal, as part of two simultaneous appeals: one from prosecutors challenging the leniency of Patterson’s original sentence, and a second from Patterson herself appealing her three murder convictions and one count of attempted murder.
During the original sentencing in September 2024, trial judge Christopher Bale ruled that Patterson must serve 33 years behind bars before becoming eligible to apply for parole. Prosecutor Brendan Kissane told the appellate panel this original non-parole period is “manifestly inadequate” given the severity of the crimes. Kissane argued that Patterson should be barred from ever being considered for parole, but added that if the judges declined to issue a whole-life order, they should at minimum set a non-parole period longer than the original 33 years.
“That’s a harsh submission to make,” Kissane acknowledged of the request to eliminate any chance of parole. “But … it’s demanded by the nature of the offending,” he added, describing Patterson’s actions as “pitiless behavior” and “truly dreadful.” Court documents submitted by the prosecution note there is no prior case in Australian legal history factually comparable to these crimes, for reference, the prosecution cited two prior Australian mass murder cases where offenders received far longer non-parole terms: Osman Shaptafaj, who killed his daughter and her son-in-law over an uninvited wedding attendance, received a 35-year non-parole period in 2022, while Jaymes Todd, who raped and murdered comedian Eurydide Dixon in 2018, was ordered to serve 43 years behind bars before parole eligibility.
Under Victoria state law, judges are required to set a fixed non-parole period for murder convictions unless the nature of the offense or the defendant’s criminal history makes a minimum term inappropriate. Under the original 33-year term, Patterson would only become eligible for parole consideration at the age of 82, a timeline prosecutors argue is still insufficient for the gravity of her crimes.
The deadly incident dates back to July 2023, when Patterson hosted a lunch at her rural Leongatha property, serving homemade beef Wellington pastries laced with death cap mushrooms, one of the deadliest naturally occurring toxic fungi in the world. Those who ate the meal included Don and Gail Patterson, parents of Erin Patterson’s estranged husband Simon, Gail’s sister Heather Wilkinson, and Heather’s husband Ian Wilkinson. Simon Patterson was invited but did not attend the gathering. Don, Gail and Heather all died within days of the lunch, while Ian Wilkinson spent weeks in intensive care before surviving the poisoning.
During her trial, Patterson maintained the poisoning was a tragic accident, claiming she had misidentified the toxic mushrooms as an edible variety when she foraged them. She is now appealing her convictions on multiple grounds, one of which is the argument that the five days of cross-examination she underwent during trial was “unfair and oppressive.” On Thursday, prosecutor Jeremy McWilliams rejected this claim, telling the court the cross-examination was “thorough, fair and conducted in accordance with settled principles and the prosecutor’s overarching duty of fairness.” McWilliams added that the trial defense team itself described Patterson as a “pedantic witness,” requiring the prosecution to rephrase questions repeatedly to get a responsive answer from her.
Another point of contention in the appeals process is Patterson’s current prison conditions. She is currently held in the high-security Gordon Unit at the Dame Phyllis Frost Centre, a women’s prison in Melbourne, a facility reserved for inmates deemed at high risk of harm from other prisoners due to the notoriety of their crimes. During the original sentencing, Judge Bale noted there was a “substantial chance” that Patterson would remain in solitary confinement for years to come. Patterson’s lead appellate lawyer, Richard Edney, argued that her current conditions meet the United Nations’ definition of solitary confinement – 22 or more hours of seclusion per day with no meaningful human contact. Kissane countered this claim, telling the court the original judge’s conclusion about long-term solitary confinement was not supported by evidence, and that Patterson’s prison conditions are subject to monthly review.
In additional context revealed after the trial, Simon Patterson gave pre-trial testimony claiming he suspected his estranged wife had deliberately poisoned him on multiple occasions between late 2021 and mid-2022, making him seriously ill with homemade meals. No toxic substances were ever confirmed in these alleged incidents. Erin Patterson was initially charged with three counts of attempted murder against Simon, but she denied all allegations, and prosecutors dropped all charges related to the husband before the murder trial got underway in April 2025.
Whole-life sentences with no chance of parole are extremely rare for prisoners in Australia. The three appellate judges have opted to reserve their decision on both appeals, with no date set for a ruling yet.