Erin Patterson prepared the meal at her home in Leongatha that left diners with suspected death cap mushroom poisoning

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A beef wellington pie was the lunchtime dish that is believed to have left three people dead and one fighting for his life from a suspected mushroom poisoning, according to a source familiar with the situation.

Erin Patterson, 45, prepared the meal at her home in Leongatha on 29 July for her former parents-in-law Don and Gail Patterson, and Gail’s sister Heather Wilkinson and her husband, Ian.