An Australian court has dismissed mushroom killer Erin Patterson’s appeal against her murder convictions and resentenced her to life in prison without the possibility of parole.

Patterson, 51, was convicted of murdering three relatives and attempting to murder another after serving them a meal containing death cap mushrooms at her home at Leongatha in Victoria in July 2023.

The victims were her former parents-in-law, Don and Gail Patterson, and Gail’s sister, Heather Wilkinson. Heather’s husband Ian Wilkinson survived after being hospitalised.

She was initially sentenced to life imprisonment, with the possibility of parole after 33 years.

On Friday, Victoria’s Court of Appeal rejected her challenge to the convictions and upheld prosecutors’ arguments that the original sentence was too lenient because it left open the possibility of her eventual release.

Justice Stephen McLeish set aside the 33-year non-parole period previously imposed on Patterson, ruling that the seriousness of her crimes meant she…