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Home / World

Erin Patterson trial: Husband details relationship issues, mushroom case

By Liam Beatty
news.com.au·
2 May, 2025 11:02 AM7 mins to read

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Australian mother of two Erin Patterson is on trial for allegedly poisoning her in-laws with death cap mushrooms.

Australian mother of two Erin Patterson is on trial for allegedly poisoning her in-laws with death cap mushrooms.

  • Erin Patterson is on trial for allegedly poisoning her in-laws with death cap mushrooms.
  • Simon Patterson described their relationship breakdown and disputes over child support payments.
  • Erin Patterson has pleaded not guilty, claiming the mushroom poisoning was unintentional.

The husband of alleged triple-murderer Erin Patterson has detailed the pair’s relationship breakdown to an Australian court, accusing the mushroom cook of becoming “extremely aggressive” over child support payments.

Patterson, 50, is facing trial over the alleged death cap mushroom poisonings of her husband Simon Patterson’s parents and aunt and uncle at a lunch she hosted on July 29, 2023, at her Leongatha home.

The mother of two has pleaded not guilty to three counts of murder and one count of attempted murder, arguing at trial the presence of poisonous mushrooms in her beef wellington dish was not intentional and not deliberate.

On Friday, Simon spoke about their marriage and how the relationship between the two allegedly soured.

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‘Extremely aggressive’: Relationship soured over child support, husband claims

The case has turned to issues that arose in the estranged couple’s relationship after Patterson applied for child support payments.

The jury was told that in 2022, years after they separated in 2015, Simon filed a tax return indicating they were separated.

This, he said, raised issues with Patterson over family tax benefits and they agreed to her applying for child support payments.

But in late 2022, Simon spoke to someone from the Department of Human Services who advised him he should stop paying expenses such as school fees and medical bills.

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“She really emphasised it in the conversation with me … my understanding was she’d seen other people end up double paying and get really upset,” he said.

Simon agreed communication with Patterson became emotive over the issue with “pettiness” on both sides.

“From my point of view, Erin was being extremely aggressive. I thought a mediator could help us with it,” he said.

Patterson’s barrister, Colin Mandy, SC, told the court Simon’s child support obligations were assessed at $38 a month, questioning him on whether he could see that from his client’s perspective this was “extremely unfair”.

Simon agreed, acknowledging $38 was far less than he’d previously paid in private school fees.

‘Never actually asked’

The jury was also told Patterson “never actually asked” for updates on the conditions of the people she is accused of poisoning.

Her estranged husband faced a second day of cross-examination by Mandy before the Latrobe Valley Supreme Court on Friday.

Mandy asked if, beyond telling Patterson his parents were ill, he had updated her as their conditions worsened.

“Um, it intrigued me that she never actually asked,” Simon said.

“The answer is yes we didn’t have that conversation.”

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Simon Patterson was also questioned on the conversation he’d had with his father in hospital the day following the lunch.

He told the court Don Patterson had mentioned to him that Erin had brought up a cancer diagnosis as the reason for the lunch and wanted advice on “how to break it to the kids”.

“I came out of that conversation believing she had a diagnosis with cancer or at least she told him she had a diagnosis with cancer,” he said.

Simon pushed back on a suggestion by Mandy, that it was possible Don had said a suspected diagnosis not a confirmed diagnosis.

“I reckon we’re starting to get in the rounds of flying teapots possibility,” he said.

“Miscommunications happen, it’s possible I misunderstood … that’s at the flying teapot end of possibility.”

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Jury warned to avoid conversations over weekend: judge

The 15-person jury was sent home for the weekend shortly before 1pm after receiving a warning not to discuss the case or look up information.

Justice Christopher Beale said there had been extensive media coverage and people in their personal lives would no doubt want to discuss the case.

“You have to shut that conversation down. You have to say I can’t talk about it,” he said.

He urged jurors to rest and come back to court on Monday, when Simon will continue giving evidence.

“The best preparation is to have a good weekend and to come back to court refreshed,” he said.

‘I’m very hurt’: Patterson felt left out of family event

Under questioning by Mandy, Simon agreed that after their separation in 2015, Patterson remained a part of the extended family and attended events.

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A series of Signal messages between the pair on October 14, 2022, were shown to the jury in which Patterson expressed a fear she was being left out.

“Hey are you coming to mum‘s birthday lunch tomorrow,” Simon asked her.

“See my invite tomorrow is a bit of an afterthought. I might pass as I’m not going to go somewhere I’m not wanted,” she responded.

“What I reckon is everybody forgot to actually invite me to this thing and I’m very very hurt by this.”

Simon responded: “You’re as far off the mark … you already have the facts but you can think what you want.

“I know they would love you to be there. They’ve been talking about this for a week.”

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Patterson later said she’d been messaged by his parents and agreed to come, with the pair apologising to each other.

Health battles laid bare in mushroom trial

Questioned on Patterson’s experience with hospitals, Simon confirmed his wife had a history of leaving hospitals against medical advice.

“That’s fair, Erin hates hospitals,” he said.

He told the court Patterson had told him about a number of medical issues over their relationship, including a heart arrhythmia, a chronic disease and post-natal depression.

“I believed that to be true and I still have no reason to not believe that,” he said.

“She struggled a lot with mental illness especially post-natal depression after [our son] was born.”

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The court was told about a text message exchange between the pair in late 2022, when Patterson was visiting Tasmania with their two children.

“Hey do you remember that stupid Latin name that was given for my heart issue,” Patterson messaged.

“It sounded like sinus tachycardia, why do you ask?” Simon responded.

“Thanks, just curious and wanted to google it,” she replied.

Tears as ‘rocket car’ video played

Mandy played a video taken 12 days before the fatal lunch that killed three people, depicting Simon’s son and father conducting a “science experiment”.

The pair ignite a “rocket car” in a backyard.

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“Oh, it’s working but why isn’t it going,” Simon’s mother Gail Patterson says in the recording.

Simon teared up and gave a big exhale as the footage was played, grabbing a tissue. He confirmed his son and his father had a close relationship and the boy was being tutored by the former schoolteacher.

Simon Patterson faced extensive questioning as the first witness to be called on Thursday, first by Crown prosecutor Nanette Rogers, SC, and later by Mandy.

For much of the day’s hearing, Patterson answered the hundreds of questions in a calm and measured approach, but his voice began to falter and his eyes began to tear up as the topic turned to the first time he saw his parents in hospital.

He reached for the tissue box and blew his nose as he described seeing them in the Korumburra Hospital the morning of July 30, 2023.

“Dad was substantially worse than Mum. He was really struggling,” he said.

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“He was lying on his side, he was hunched quite noticeably. A really discoloured face … speaking was an effort and taking the energy to speak was an effort.

“His voice was strained in a way that was, he wasn’t right inside. He was feeling pain.”

Simon’s aunt Heather Wilkinson and Gail both died from multiple organ failure because of amanita poisoning on August 4.

Don died the following day from the same poisoning, while Wilkinson’s husband Ian gradually recovered and was discharged on September 11.

Prosecutors allege Patterson deliberately poisoned the quartet with “murderous intent” after serving a beef wellington lunch containing death cap mushrooms at her home on July 29.

Patterson, however, contends she did not intentionally nor deliberately poison her in-laws but accepts there were death cap mushrooms in the meal.

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She has pleaded not guilty to three counts of murder and one count of attempted murder.

The trial continues.

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