Ian Wilkinson, the sole survivor of a deadly lunch involving death cap mushrooms, provided testimony on Tuesday at Erin Patterson's trial, where she faces three counts of murder and one count of attempted murder.

Wilkinson described the events leading to the poisoning, highlighting a lunch invitation he received from Patterson two weeks prior to the gathering on July 29, 2023.

Wilkinson stated that he and his wife, Heather, along with her sister Gail and her husband Don, initially arrived at Patterson's home in Leongatha, Victoria, where they anticipated a friendly social gathering.

However, it became apparent that the atmosphere was tense when Heather showed interest in viewing Patterson's pantry, which Patterson appeared reluctant to reveal.

Wilkinson speculated that the pantry's condition may have induced embarrassment for Patterson.

During the lunch, each guest was served an individual portion of what was described as a pastry case filled with steak and mushrooms.

Wilkinson noted that they communicated light-hearted banter at the table, with Don consuming an additional serving of his wife’s Wellington.

After the main meal, discussions shifted to more serious matters as Patterson disclosed her cancer diagnosis and sought advice on how to tell her children.

Wilkinson offered to pray for her, seeking blessings for her health and guidance in her communications with her family.

Following the meal, Wilkinson and the others began to feel unwell, attributing their symptoms to gastroenteritis at first.

However, their condition deteriorated rapidly, leading to their hospitalization.

The group was diagnosed with death cap mushroom poisoning, resulting in the deaths of Heather, Gail, and Don within days at the Austin Hospital.

Wilkinson was hospitalized in intensive care until August 21, after which he was transferred to a rehabilitation ward.

Patterson, 50, has pleaded not guilty to all charges, claiming ignorance about the toxicity of the meal served to her guests.

Her legal representation characterized the incident as a tragic accident during the ongoing trial presided over by Justice Christopher Beale at the Latrobe Valley Courts in Morwell.