A prosecutor said Friday that the mother of a teenager now charged with killing four classmates at his Michigan high school texted her son that day, saying: "Don't do it." Oakland County Prosecutor Karen McDonald said James and Jennifer Crumbley bought a gun and made it available to Ethan Crumbley and failed to intervene when they were summoned to the school Tuesday. According to police, 15-year-old Ethan Crumbley returned to class that day and later emerged from a bathroom with a gun, firing at students in the hallway.