!['Mushroom poison killer' pleads not guilty after in-laws dead from beef wellington lunch](https://cdn.newsserve.net/ONPglobe256.png)
'Mushroom poison killer' pleads not guilty after in-laws dead from beef wellington lunch
Erin Patterson is accused of killing the parents of her estranged husband Don and Gail Patterson, both 70, and Gail's sister Heather Wilkingson, last July
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