Australian woman Erin Patterson is guilty of murdering three relatives with a toxic mushroom lunch, a jury has found.

The 50-year-old has also been found guilty of the attempted murder of the sole guest who survived the beef Wellington meal in 2023.

Patterson’s much-watched trial in the small Victorian town of Morwell heard evidence suggesting she had hunted down death cap mushrooms sighted in nearby towns, before trying to conceal her crimes by lying to police and disposing of evidence.

Her legal team had argued she unintentionally foraged lethal fungi, then “panicked” upon accidentally poisoning family members she loved. The jury on Monday ruled she did it intentionally.

Three people died in hospital in the days after the meal on 29 July 2023: Patterson’s former in-laws, Don Patterson, 70, and Gail Patterson, 70, as well as Gail’s sister, Heather Wilkinson, 66.

Local pastor Ian Wilkinson – Heather’s husband – recovered after weeks of treatment in hospital.

Patterson’s estranged partner Simon Patterson had also been invited to the lunch but pulled out at the last minute. She was originally accused of attempting to murder him too – on several occasions – but those charges were dropped on the eve of the trial and the allegations were not put to the jury.

The case captured the world’s attention, becoming one of the most closely watched trials in Australian history.

Over nine weeks, the Victorian Supreme Court heard from more than 50 witnesses – including Patterson herself. Detectives described rifling through her garbage bins for leftovers, doctors outlined the gradual but brutal decline of the victims’ health, and Patterson’s estranged husband emotionally explained the souring nature of their relationship.

The only thing the case was missing was a motive – something key to Patterson’s defence.

Prosecutors argued Patterson had faked a cancer diagnosis to coax the guests to her house, then poisoned them and feigned illness to ward off suspicion.

She admitted to lying to police and medical staff about foraging for wild mushrooms, dumping a food dehydrator used to prepare the meal, and repeatedly wiping her mobile phone – all evidence of her guilt, prosecutors said.

From the witness box, Erin Patterson told the court she loved her relatives and had no reason to harm them.

She repeatedly denied intentionally putting the poisonous fungi in the meal, and said she realised days after the lunch that the beef Wellingtons may have accidentally included dried, foraged varieties that were kept in a container with store-bought ones.

She also told the court she had suffered from bulimia for years, and had made herself throw up after the beef Wellington meal – something her defence team said explained why she did not become as sick as the others who ate it.

The lie about having cancer was because she was embarrassed about plans to get weight-loss surgery, Ms Patterson said. She also claimed she didn’t tell authorities the truth about her mushroom foraging hobby because she feared they might blame her for making her relatives sick.

Ultimately, after a week of deliberation, the jury decided: returning four guilty verdicts which could see Patterson spend the rest of her life in jail.

The Patterson and Wilkinson families were not in court to hear the outcome of the case, and a representative said they would not be making a comment.

The Korumburra Baptist Church, where all of the victims attended and Mr Wilkinson was the pastor, said the trio were “very special people who loved God and loved to bless others”.

“We all greatly miss Heather, Don and Gail whether we were friends for a short time or over 20 years,” the statement posted to their noticeboard read.

Speaking briefly to media outside the courtroom, Victoria Police’s Detective Inspector Dean Thomas thanked the officers and prosecutors who had worked on the case.

“It’s very important that we remember that three people have died, and we’ve had a person that nearly died and was seriously injured,” he said.

“I ask that we acknowledge those people and not forget them.”

He added that the Patterson and Wilkinson families had asked for privacy, and urged that their wishes be respected.