Michigan jurors, after 11 hours of deliberations, found Jennifer Crumbley guilty of involuntary manslaughter on Tuesday for the gun rampage committed by her teenage son, who carried out the state’s deadliest school shooting more than two years ago.

The trial became a lightning rod for issues of parental responsibility, in a time of frequent cases of gun violence carried out by minors.

Crumbley, 45, was convicted on four counts of involuntary manslaughter, one for each of the four students who were shot to death by her son at Oxford High School on Nov. 30, 2021. The son, Ethan Crumbley, who was 15 at the time, used a pistol to kill Madisyn Baldwin, 17; Tate Myre, 16; Justin Shilling, 17; and Hana St. Juliana, 14. Seven other people were injured. The gun was a gift from his parents.

Crumbley faces a maximum penalty of 15 years in prison after being convicted of all four counts.

Sentencing is scheduled for April 9. Ethan, who pleaded guilty to 24 charges including first-degree murder, was sentenced last year to life in prison without the possibility of parole. He did not testify in his mother’s trial.

The decision to charge the parents with manslaughter was something of a gut judgment, Karen D. McDonald, the Oakland County prosecutor, said in an interview shortly after the charges were filed.