Native to Europe, the lethal mushrooms have been found growing in several Australian states, and around the time of the lunch, they had been seen within a short drive of Patterson’s home in rural Victoria.
During the trial, the prosecution argued that Patterson had the opportunity to pick lethal mushrooms after seeing their location posted on the citizen science iNaturalist website.
The guilty verdict suggests the jury accepted the prosecution’s argument that she likely traveled to two sites in April and May 2023, and deliberately picked the mushrooms used in the meal.
Prosecution alleged ‘calculated deceptions’
Prosecutor Nanette Rogers SC alleged that “four calculated deceptions” were at the heart of the case. “The first deception was the fabricated cancer claim she used as a pretence for the lunch invitation,” she said.
“The second deception was the lethal doses of poison the accused secreted in the homecooked beef Wellingtons. The third deception was her attempts to make it seem that she also suffered death cap mushroom poisoning and the fourth deception, the sustained cover-up she embarked upon to conceal the truth.”
Patterson admitted that on April 28 – the same day as cellphone signals put her in the vicinity of death cap mushrooms – she bought a dehydrator that she later dumped at a waste recycling center on August 2, as her guests lay in hospital.
It had her fingerprints on it and contained remnants of death cap mushrooms.
The prosecution alleged that Patterson faked illness in the days after serving the lunch and tried to cover her tracks by disposing of the dehydrator and factory resetting her devices to delete evidence.
Patterson’s defense lawyer Colin Mandy SC accused the prosecution of being selective with the evidence and pushing “four ridiculous, convoluted propositions.”
The first was that Patterson would do this “without any motive,” Mandy said.
He said there were several reasons why Patterson would not want to kill her guests. She had no money issues, lived in a big house, and had almost full-time custody of her two young children, who were very close to their grandparents, he said.
The prosecution did not have to prove motive.
Rogers accused Patterson of having two faces: One she showed the world that suggested she had a good relationship with the Pattersons, and a hidden face she showed only her Facebook friends that suggested she wanted “nothing to do with them.”
In Facebook messages sent in December 2022, Patterson had expressed anger and frustration over Don and Gail’s reluctance to get involved in their son’s marriage breakdown.
“I’m sick of this shit I want nothing to do with them,” she wrote. “I thought his parents would want him to do the right thing but it seems their concern about not wanting to feel uncomfortable and not wanting to get involved in their son’s personal matters are overriding that so f*** em.”
And another message read: “This family I swear to f***ing god.”
During eight days of testimony including cross-examination, Patterson consistently pleaded her innocence, claiming she inadvertently added foraged mushrooms to the meal.
In his directions to the jury, Justice Christopher Beale said that Patterson’s admission that she told lies and disposed of evidence must not cause them to be prejudiced against her.
“This is a court of law, not a court of morals,” he said.
“The issue is not whether she is in some sense responsible for the tragic consequences of the lunch, but whether the prosecution has proved beyond a reasonable doubt that she is criminally responsible for those consequences,” he said.
The jury found that Patterson had intended to kill all four lunch guests and lied repeatedly on the stand to claim she didn’t.
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