Supreme Court of Victoria schedules August appeal for ‘mushroom murderer’ conviction

The Supreme Court of Victoria has confirmed that the appeal hearing for Erin Patterson, widely identified in media reports as the “mushroom murderer,” will proceed on August 19 and 20. The two-day session will address both Patterson’s application to overturn her conviction and the prosecution’s separate appeal regarding the severity of her sentence.

Patterson was sentenced to life imprisonment in September 2026 after a jury found her guilty in July of murdering three of her estranged husband’s relatives. The victims, Gail Patterson, Donald Patterson, and Heather Wilkinson, died in August 2023 after consuming a beef Wellington lunch laced with toxic fungi. Patterson was also convicted of attempting to kill Heather Wilkinson’s husband, Ian Wilkinson, who survived the poisoning but required a liver transplant after spending seven weeks in hospital.

Patterson’s legal team formally applied to appeal the conviction in November, citing seven grounds that include a “substantial miscarriage of justice.” Central to the defence’s argument is a claim of “fundamental irregularity” concerning jury sequestration. Her lawyers contend that the jury remained at the same hotel as key figures in the case, including a police witness and two prosecutors, potentially compromising the impartiality of the proceedings.

Further grounds for the appeal include assertions that several pieces of evidence were irrelevant or unfairly prejudicial, and that the prosecution’s cross-examination was “unfair and oppressive.” Patterson maintains her innocence throughout the process, asserting that the poisoning was an accident rather than a deliberate act of murder.

Concurrently, the prosecution is appealing the sentence imposed in September, arguing it is “manifestly inadequate.” Prosecutors had unsuccessfully sought a life imprisonment term without the possibility of parole during the trial. They now argue that allowing Patterson to be considered for parole after 33 years fails to reflect the gravity of the crimes. The case attracted significant international attention, with more than 250 journalists registering for court updates and the judge ordering the sentencing to be broadcast live.