Colin Gray, 55, admitted to providing the assault rifle used by his then-14-year-old son in the September 2024 shooting at Apalachee High School. Colin Gray, 55, admitted to providing the assault rifle used by his then-14-year-old son in the September 2024 shooting at Apalachee High School. Colin Gray, 55, admitted to providing the assault rifle used by his then-14-year-old son in the September 2024 shooting at Apalachee High School. Colin Gray, 55, admitted to providing the assault rifle used by his then-14-year-old son in the September 2024 shooting at Apalachee High School. Several other parents have been convicted in the U.S. in connection with a mass shooting carried out by their children.