Ms Crumbley had a duty to prevent her son from harming others, prosecutors said, but failed to secure a gun and ammunition at her home and failed to get help for her son’s mental health issues.
The mother of a school shooter who killed four students at a school in the US has been convicted in a landmark case.
Jennifer Crumbley, 45, 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, in Michigan in November 2021, killing 14-year-old Hana St Juliana, 16-year-old Tate Myre, 17-year-old Madisyn Baldwin, and 17-year-old Justin Shilling and injuring seven other people.
The first-of-its-kind case against Jennifer Crumbley was brought by prosecutors who said she had a duty to prevent her son from harming others.
She was, they said, grossly negligent and could have foreseen the violence.
Ms Crumbley 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 issues.
James Crumbley, 47, bought their son the gun, a 9mm handgun, he used in the shooting, prosecutors said, even though he was too young to own his own gun under state law.
The weapon was purchased four days earlier – apparently as a Christmas present – and was “freely available” to the teenager.
He brought the weapon to school on the day of the shooting, though no one checked his rucksack.