Authorities in Australia have said Erin Patterson attempted to poison her husband on multiple occasions before serving a deadly mushroom meal that killed three people.

Prosecutors wanted to use digital records showing Patterson's post on a Facebook group about her cat eating a poisonous mushroom - despite her not having one - in her trial

The estranged husband of a woman convicted of killing three people​ with a meal laced with deadly mushrooms suspected his wife had been poisoning him before the fatal meal, an Australian court has heard.