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

Erin Patterson has been found guilty of murdering three people with a toxic mushroom lunch following a marathon ten-week trial in Victoria. Justice Christopher Beale sent the jury to deliberate last Monday, urging them to resist feelings of bias.

A doctor who treated some of the victims of the 'mushroom murderer' explains the moment he realised Erin Patterson committed the deadly crime.