The father of Colt Gray, the teen suspect in the Apalachee High School shooting, appeared in a Georgia courtroom Friday to face multiple charges stemming from this week's deadly attack.

Colin Gray, 54, is being charged with four counts of involuntary manslaughter, two counts of second-degree murder and eight counts of cruelty to children, the Georgia Bureau of Investigation said Thursday when the agency announced his arrest. The 14-year-old shooting suspect has been charged with four counts of felony murder.

GBI Director Chris Hosey said at a news conference Thursday night that the charges against Colin Gray stem from "knowingly allowing his son to possess a weapon."