By Alasdair Pal

SYDNEY (Reuters) - An Australian woman convicted of murdering three elderly relatives of her estranged husband with a meal containing poisonous mushrooms was sentenced to a minimum of 33 years in prison on Monday, in one of the longest jail terms ever given to a woman in the country.

The presiding judge said Erin Patterson showed no pity for her in-laws after she served them individual portions of Beef Wellington laced with death cap mushrooms.

Patterson was found guilty in July of killing her mother-in-law, Gail Patterson, father-in-law, Donald Patterson and Gail's sister, Heather Wilkinson, in a case that has been globally followed and dubbed the Leongatha mushroom murders.

A jury also found the 50-year-old guilty of the attempted murder of Ian Wilkinson, Heather's hu

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