Erin Patterson's murder convictions for the deaths by mushroom poisoning of her estranged husband's relatives has prompted fevered speculation across Australia about her motive.

After a nine-week trial, Erin Patterson has been found guilty of the murder of her parents-in-law and an aunt, who died days after she served them a beef wellington for lunch.

The fact she had no clear motive was central to her defence team’s arguments. Patterson, who foraged wild mushrooms in her spare time and also ate the beef wellington, claimed that the event was a tragic accident.