On November 30, 2021, 15-year-old Ethan Crumbley opened fire at Oxford High School in Michigan, killing four students—Madisyn Baldwin, Tate Myre, Hana St. Juliana, and Justin Shilling—and wounding seven others. Crumbley used a 9mm handgun that his father had purchased days before. His disturbing behavior was noticed by school staff before the shooting, but no immediate action was taken. Crumbley pleaded guilty to multiple charges, including murder and terrorism. His parents were also charged with involuntary manslaughter for failing to secure the firearm and address his mental health concerns​.