The teen is charged with murder, and his father is accused of second-degree murder for providing his son with a semiautomatic, AR 15-style rifle used to kill children. Arrest warrants say the elder Gray did so knowing his son “was a threat to himself and others.

The suspect, Colt Gray, has been charged with four counts of murder for the Wednesday morning attack in which two students and two math teachers were killed and eight other students were injured. During his first court appearance on Friday, a judge informed him that he could face a maximum penalty of life in prison.