Apalachee High shooter Colt Gray pleads guilty to 55 counts

Colt Gray, the gunman behind the Apalachee High School shooting, has pleaded guilty to 55 counts. His father, Colin Gray, was previously convicted by a jury on charges including second-degree murder and involuntary manslaughter in connection with the same attack. The case is among the most high-profile school shootings in the United States in recent years.