The mother of a school shooter who killed four students at a school in Michigan has been convicted in a landmark case.

Jennifer Crumbley was found guilty of four counts of involuntary manslaughter and faces 15 years in prison for each charge.

Her son Ethan was 15 when he opened fire at Oxford High School, killing 14-year-old Hana St. Juliana, 16-year-old Tate Myre, 17-year-old Madisyn Baldwin, and 17-year-old Justin Shilling.

The case against Jennifer Crumbley was brought by prosecutors who said she had a duty to prevent her son from harming others.

She was also accused of failing to secure a gun and ammunition at her home and failing to get help for her son’s mental health.

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