Timeline from ABC.
This is the timeline of events in 2023 before and after the lunch, as set out by the prosecution:
February 12 — 15
Erin allegedly starts using two mobile phones, known as Phone A and Phone B, using a SIM card with the number 04XX XXX 783.
March 24
Erin is told she has tested negative for cervical cancer after a self-administered screening test.
April 18
A user on iNaturalist, a website for tracking plants and fungi, finds death cap mushrooms in the Loch area and posts about them online, before removing as many as she can.
April 28
The prosecution says Erin's mobile phone data suggests she travels to Loch before returning to Korumburra.
Two and a half hours later, Erin allegedly purchases a Sunbeam food lab electronic dehydrator from a Leongatha store.
March to May
Erin allegedly starts posting about dehydrating mushrooms in a true crime Facebook group, detailing how she put powdered mushrooms into different foods.
May 21
Another iNaturalist user posts a photo and the exact location of death cap mushrooms growing in Outtrim.
May 22
The prosecution says Erin's mobile phone data suggests she travels to Loch and Outtrim.
June 28
Erin allegedly tells Donald and Gail that she has an appointment with St Vincent's Hospital on this date, and tells Gail the next day a biopsy was taken of a lump in her elbow.
July 11
Erin allegedly connects a new SIM card with the number 04XX XXX 835.
July 16
Erin attends a service at Korumburra Baptist Church and invites Don, Gail and Simon Patterson and Ian and Heather Wilkinson to lunch on July 29.
July 28
Simon messages Erin, saying he will not be attending the lunch due to feeling too "uncomfortable".
July 29
Erin Patterson serves a lunch of beef Wellington to four guests at her home in Leongatha.
July 30
Don and Gail ring Simon, complaining of serious illness. They travel via ambulance to Dandenong Hospital.
Simon picks up Heather and Ian, taking them to Korumburra Hospital, then Leongatha Hospital.
Erin allegedly tells one of her children she feels unwell, and spends the day running errands with her children before serving them a meal she says is leftovers from the lunch.
July 31
Doctors at Leongatha and Dandenong Hospital confer about the poisonings. Don, Gail, Heather and Ian are transferred to the Austin Hospital in Melbourne.
Erin drops her children to school, then texts Simon and asks him to take her to hospital, but he tells her to get there herself.
Erin presents to Leongatha Hospital around 8am, but allegedly declines a full examination and checks herself out.
Over the next hour, her phone is recorded connecting to mobile phone networks towers in Leongatha, Koonwarra and Outtrim.
Erin returns to the hospital around 9:48am. She is transferred to Monash Medical Centre, and meets Simon and her children there.
Don and Gail arrive at Austin Hospital.
August 1
Heather and Ian arrive at Austin Hospital.
Despite escalating medical treatment, Donald, Gail and Heather continue to deteriorate.
Erin is assessed by a doctor at Monash, who says she appears clinically well and all her vital signs are within normal limits. She is discharged from hospital about 1pm.
The Department of Health interviews Erin about the lunch. She says she bought dried mushrooms from an Asian grocer in Melbourne's south-east.
August 2
Erin allegedly conducts a factory reset on Phone B, which she had been using before February 12.
She allegedly drives to Koonwarra Transfer Station and Landfill, and deposits items into an e-waste bin.
Monash Council begins visiting Asian-style grocery stores in Melbourne's south-east to find products matching Erin's description.
August 3
A Victoria Police investigation is launched into the July 29 lunch.
Erin allegedly moves her SIM card with the number 04XX XXX 835 into Phone B.
August 4
Heather dies at 2:50am.
Gail dies at 5:55pm.
Police travel to Koonwarra Transfer Station and find a black Sunbeam dehydrator in an e-waste bin.
August 5
Donald dies at 11:30pm.
A search warrant is executed at Erin's Leongatha house, where police seize Phone B with SIM card number 04XX XXX 835.
Erin is taken to Wonthaggi Police Station and interviewed.
August 6
Erin allegedly remotely conducts a factory reset of Phone B, which is still held by police.
Erin allegedly continues to use Phone A with number 04XX XXX 783. Police say they never recover this phone.
August 11
The Department of Health concludes its investigation and is unable to find any store selling mushrooms matching Erin's description.
September 11
Ian Wilkinson is moved into a rehabilitation ward.
November 2