The first parents convicted in a U.S. mass school shooting have been sentenced to at least 10 years in prison in Michigan. The judge said Tuesday that Jennifer and James Crumbley missed opportunities that could have prevented their son from possessing a gun and killing four students at Oxford High School in 2021. Judge Cheryl Matthews says poor parenting wasn't on trial. Rather, the judge says the Crumbleys ignored things that should have raised the hair on the back of their necks. The Crumbleys were convicted of involuntary manslaughter. They were accused of failing to secure a gun and ignoring Ethan Crumbley's mental health.