Michele Anderson is to be formally sentenced to life in prison on Thursday. She was convicted in March for the 2007 fatal shootings of six of her relatives during a Christmas Eve gathering in Carnation.

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Michele Anderson is to be sentenced Thursday morning to life in prison without the possibility of release for her role in killing six members of her family on Christmas Eve 2007 in Carnation.

A King County jury convicted Anderson of six counts of aggravated first-degree murder in March for killing her parents, brother, sister-in-law, niece and nephew during a holiday gathering.

Prosecutors said Anderson was angry with her brother for refusing to pay back $40,000 she said he borrowed over the years, and was also angry at her parents for asking that she and her then-boyfriend, Joseph McEnroe, start paying rent on a mobile home they shared on her parents’ property.

Because prosecutors did not seek the death penalty against Anderson, her only possible punishment is life behind bars.

McEnroe, Anderson’s co-defendant, is currently serving six life sentences for the deaths of Anderson’s parents, Wayne and Judy Anderson, 60 and 61; brother Scott Anderson and his wife, Erica Anderson, both 32; and the younger couple’s children, 5-year-old Olivia and 3-year-old Nathan. He was convicted following a separate trial last year.

Anderson’s sentencing hearing before Superior Court Judge Jeffrey Ramsdell begins at 9 a.m. and is expected to last two hours, with the judge to hear statements from loved ones impacted by the six deaths.