Australian mother guilty of murdering three people with poisonous mushrooms

Cliff Notes

Erin Patterson, 50, has been convicted of murdering her estranged husband’s parents and an aunt by serving them beef wellington laced with death cap mushrooms.
The court heard that all four guests fell ill after the meal on 29 July 2023, resulting in the deaths of three individuals while one survived after hospitalisation.
The prosecution presented evidence that Patterson attempted to fabricate a cancer diagnosis to excuse the absence of her children from the gathering.

Australian mother guilty of murdering three people with poisonous mushrooms

An Australian mother has been found guilty of murdering her estranged husband’s parents and an aunt by serving them a beef wellington laced with poisonous mushrooms.

Erin Patterson, 50, invited her former parents-in-law, Don and Gail Patterson, both 70, and Gail Patterson’s sister, Heather Wilkinson, 66, to the fatal lunch on 29 July 2023.

The mother-of-two, from the state of Victoria in southern Australia, has also been convicted of the attempted murder of Mrs Wilkinson’s husband Reverend Ian Wilkinson.

All four fell ill after eating a meal of beef wellington, mashed potatoes and green beans at Patterson’s home in the town of Leongatha, the court was told.

Prosecutors said Patterson knowingly laced the beef pastry dish with deadly death cap mushrooms, also known as Amanita phalloides, at her home.

The guests ate their meals off four large grey dinner plates, while Patterson ate from a smaller, tan-coloured plate, the court heard.

Mrs Wilkinson and Mrs Patterson died on Friday 4 August 2023, while Mr Patterson died a day later.

Reverend Wilkinson spent seven weeks in hospital but survived.

Her estranged husband Simon Patterson, with whom she has two children, was also invited to the lunch and initially accepted but later declined, the trial heard.

The jury was told that prosecutors had dropped three charges that Patterson had attempted to murder her husband, who she has been separated from since 2015.

Reverend Wilkinson said that immediately after the meal, Patterson fabricated a cancer diagnosis, suggesting the lunch was put together so that she could ask them the best way to tell her children about the illness.

The prosecution said she did this to justify the children’s absence.

The defence did not dispute that Patterson lied about having cancer.

The trial attracted intense interest in Australia – with podcasters, journalists and documentary-makers descending on the town of Morwell, around two hours east of Melbourne, where the court hearings took place.

What makes death cap mushrooms so lethal?

The death cap is one of the most toxic mushrooms on the planet and is involved in the majority of fatal mushroom poisonings worldwide.

The species contains three main groups of toxins: amatoxins, phallotoxins, and virotoxins.

From these, amatoxins are primarily responsible for the toxic effects in humans.

The alpha-amanitin amatoxin has been found to cause protein deficit and ultimately cell death, although other mechanisms are thought to be involved.

The liver is the main organ that fails due to the poison, but other organs are also affected, most notably the kidneys.

The effects usually begin after a short latent period and can include gastrointestinal disorders followed by jaundice, seizures, coma, and eventually, death.

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Erin Patterson, 50, has been convicted of murdering her estranged husband's parents and an aunt by serving them beef wellington laced with death cap mushrooms.