A teenager has pleaded guilty to all 55 counts in a deadly shooting nearly two years ago at Apalachee High School in Georgia.

Colt Gray, 16, entered the plea Friday without having reached a deal with prosecutors. He had previously pleaded not guilty to charges in the Sept. 4, 2024, shooting that killed two students and two teachers, and left several others wounded, at the high school about 45 miles (73 kilometers) northeast of Atlanta.

Barrow County Superior Court Judge Nicholas Primm is now expected to hear each side’s summary of the case, evidence and sentencing recommendation before deciding the sentence.

Gray’s trial had been scheduled to start in mid-October in Columbia County, about 100 miles (160 kilometers) from where the shooting happened, after the judge agreed to a defense request for a change of venue.

A jury in March convicted his father, Colin Gray, on charges including second-degree murder and involuntary manslaughter, and he is scheduled to be sentenced next week. Prosecutors said the elder Gray gave his son the assault-style rifle used to open fire at the school.

Teachers Richard “Ricky” Aspinwall, 39, and Cristina Irimie, 53, and students Mason Schermerhorn and Christian Angulo, both 14, died in the shooting. Another teacher and eight more students were wounded, seven of them hit by gunfire.