On November 30, 2021, a terrorist mass shooting occurred at Oxford High School in the Detroit exurb of Oxford Township, Michigan, United States. 15-year old Ethan Crumbley, armed with a 9 mm semi-automatic handgun, murdered four students and injured seven people, including a teacher. Authorities arrested and charged Crumbley as an adult for 24 crimes, including murder and terrorism. Crumbley pleaded guilty to all of the charges in October 2022.

Crumbley’s parents, Jennifer and James Crumbley, were charged on December 3 with involuntary manslaughter for failing to secure the handgun used in the shooting.[10] After failing to appear for their arraignment, the parents were the subjects of a manhunt by the U.S. Marshals; they were caught and arrested in Detroit on December 4. Lawsuits were filed against the school district, Oxford Community Schools, starting on December 9; they allege negligence by school officials towards warning signs exhibited by Crumbley leading up to the shooting.