Jennifer Crumbley is on trial for four counts of involuntary manslaughter, tied to her son's mass shooting at a Michigan high school in 2021.

The prosecution claims she negligently allowed her son access to a firearm and ignored his mental health problems.

Jennifer Crumbley's defense suggests her husband and the school share the blame, while she stands firm without expressing regret for her actions.

The trial scrutinizes her awareness of her son's mental state, his access to the gun, and her lack of action during a crucial school meeting on the day of the shooting.

This case is testing the boundaries of parental liability in mass shooting incidents.

Ethan Crumbley, the son, has already been sentenced to life without parole, while his father faces a separate trial soon.

The outcome of Jennifer Crumbley's trial may set a precedent on parental accountability for their children's violent crimes, with a maximum penalty of 15 years in prison if convicted.