On November 30, 2021, a mass shooting occurred at Oxford High School in the Detroit exurb of Oxford Township, Michigan, United States. Ethan Robert Crumbley, age 15, armed with a 9mm 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. On December 8, 2023, Crumbley was sentenced to life without the possibility of parole plus an additional 24 years.