Australia’s infamous mushroom killer Erin Patterson is back in court, nearly a year after being sentenced to life imprisonment for murdering three relatives in a case that captivated the country.
Patterson, 51, is fighting to overturn her convictions, claiming that serious errors during her trial prevented her from receiving a fair hearing.
At the same time, prosecutors are challenging her sentence and arguing that she should never be released from prison.
The deadly lunch
Patterson was convicted of murdering her former in-laws, Don and Gail Patterson, both 70, and Gail’s sister, Heather Wilkinson, 66.
The three died after eating a lunch at Patterson’s home in Leongatha, Victoria, in July 2023.
Prosecutors alleged that Patterson deliberately served them beef Wellington containing deadly death cap mushrooms.
Heather’s husband, local pastor Ian Wilkinson, also ate the meal but survived after spending weeks in hospital. He continues to suffer health problems linked to the poisoning.
Patterson’s estranged husband, Simon Patterson, had been expected to attend the lunch but cancelled at the last moment.
His decision became significant during the trial because evidence revealed that he had previously suffered severe illnesses after eating meals prepared by Patterson. He had reportedly fallen into a coma, undergone major bowel surgery and been close to death on more than one occasion.
Patterson has always denied deliberately poisoning anyone.
She told the court that the mushroom poisoning was a tragic accident and said her attempts to dispose of evidence afterward were driven by panic because she feared investigators would blame her for the deaths.
Patterson says her trial was unfair
Patterson is not appearing physically in court. She is participating through a video link from Dame Phyllis Frost Centre, the maximum-security prison where she is serving her sentence.
Her lawyers have raised seven grounds of appeal.
One concerns evidence involving Patterson’s mobile phone. Prosecutors used location data to argue that she had travelled to areas where death cap mushrooms had recently been found.
Her defence says the evidence should not have been presented to the jury because it was prejudicial and did not properly establish that she deliberately obtained poisonous mushrooms.
Her lawyers also challenge messages involving people connected to Patterson through Facebook. Some of those messages contained angry comments about her relatives and estranged husband.
The defence argues that these communications unfairly portrayed Patterson to the jury.
At the same time, Patterson’s lawyers say evidence about her long-standing interest in mushroom foraging was wrongly excluded.
They argue that the evidence could have supported her explanation that she had experience with mushrooms but never intended to poison her family.
Dispute over the prosecution’s case
Patterson’s legal team is also attacking the way prosecutors presented their case.
Her lawyers argue that prosecutors took inconsistent positions about her possible motive, initially indicating they would not rely on a particular motive before later making arguments that suggested there was one.
They also object to the way Patterson was cross-examined for five days by prosecutor Nannette Rogers.
The defence has described the questioning as “unfair and oppressive”, arguing that it contributed to an unfair trial.
But perhaps the most dramatic argument concerns the jury.
The jury stayed in the same hotel as people connected to the case
The enormous media interest surrounding Patterson’s trial meant special arrangements were made to keep the jurors away from outside influence.
During deliberations, they were required to stay in supervised accommodation and have very limited contact with the outside world.
But a shortage of hotel rooms created by the media frenzy reportedly resulted in the jury staying in the same hotel as members of the prosecution team, a key police witness and journalists.
The jurors occupied an entire floor.
The trial judge previously found no evidence that the jurors interacted with anyone connected to the case.
Patterson’s lawyers nevertheless argue that the arrangement represented a serious procedural failure.
They say the situation “fatally undermined” the integrity of the verdicts and are asking the appeal court to throw out the convictions and order a retrial.
Prosecutors want Patterson to stay behind bars for life
While Patterson is fighting for her freedom, prosecutors are asking the court to make her punishment even harsher.
She was sentenced to life imprisonment last year but given the possibility of applying for parole after 33 years.
The prosecution argues that this is far too lenient for the murders.
The sentencing judge, Christopher Beale, described the crimes as being among the worst of their kind but considered Patterson’s prison conditions when determining the non-parole period.
She had already spent 15 months in solitary confinement by the time she was sentenced.
The judge also warned that Patterson’s notoriety could mean she would remain isolated for her own protection for years.
Prosecutors are now seeking to overturn the 33-year parole eligibility period.
If they succeed, Patterson could face an even longer period before becoming eligible for release — or potentially spend the rest of her life in prison without parole.
What happens now?
Three judges are hearing Patterson’s appeal.
A decision is not expected immediately and could take months.
If the court overturns her convictions, it could order a new trial or, depending on its findings, result in her acquittal.
If the convictions stand, Patterson will continue serving her life sentence.
The prosecution’s separate appeal could then determine whether she will ever have a realistic chance of leaving prison.
For now, the woman at the centre of Australia’s infamous mushroom murder case remains behind bars — while three judges consider whether the original verdict should stand.