Jurors have seen a photo of an empty gun case and an ammunition box found on a bed after a mass shooting at a Michigan school in 2021. The open case and box were in James Crumbley’s home bedroom. He’s the father of Ethan Crumbley, who killed four students and wounded more at Oxford High School. James Crumbley is charged with involuntary manslaughter. He’s accused of failing to safely store a handgun used by his son in the 2021 attack and ignoring signs of the boy’s mental despair. The trial is in its fourth day. Jennifer Crumbley was convicted of the same charges last month.