Ethan Crumbley, the 16-year-old accused of killing four students in a shooting at a Michigan high school last year, pleaded guilty to all charges against him on Monday.
Driving the news: Crumbley, who was charged as an adult, pleaded guilty to 24 charges, which include four counts of first-degree murder, seven counts of attempted murder and one count of terrorism causing death for the Nov. 30 shooting.