Prosecutors argued that Colin Gray bore responsibility for the 2024 shooting because he had given his son a gun and failed to act as the teen’s mental health deteriorated.

© Pool Atlanta Journal-Constitution, via Associated Press

The boy pleaded guilty to 55 charges stemming from the 2024 attack at Apalachee High School in Winder, Ga., that killed two students and two teachers.

© Pool photo by Jason Getz

Colt Gray, 16, had been scheduled to go on trial in October. His change of plea took place at a hearing that pivoted immediately to sentencing.

© Amanda Kathleen Greene for The New York Times