Former Students Testifying in James Crumbley Case Deemed “Prejudicial” by Investigator; Examine Every Detail for Clues to Uncover Truth. James Crumbley, father of school shooter Ethan Crumbley, is facing charges of involuntary manslaughter after his son committed a mass shooting at Oxford High School in Michigan. The prosecution argues that former students’ testimony is crucial in establishing a pattern of behavior that led to the tragic events. The investigator is meticulously dissecting every piece of evidence to determine the extent of Crumbley’s involvement in the deadly incident.