The parents of a Michigan school shooter are asking a judge to keep them out of prison as they face sentencing for their role in an attack that killed four students in 2021.

Jennifer and James Crumbley are scheduled to appear in court Tuesday for the close of a pioneering case: They are the first parents convicted in a U.S. mass school shooting.

The Crumbleys did not know their son, Ethan Crumbley, was planning the shooting at Oxford High School. But prosecutors said the parents failed to safely store a gun and could have prevented the shooting by removing the 15-year-old from school when confronted with his dark drawing that day.

Prosecutors are seeking at least 10 years in prison for involuntary manslaughter.