he mother of a shooter who killed four students at a high school in Oxford, Mich., in 2021 was found guilty Tuesday on all charges of involuntary manslaughter. Jennifer Crumbley, 45, had pleaded not guilty to four involuntary manslaughter counts, and the jury found her guilty after 10 hours of deliberation, per CNN. Her son, Ethan Crumbley, was sentenced to life in prison in December after he pleaded guilty in 2022 to two dozen charges, including terrorism and first-degree murder.