WINDER, Ga. (AP) — The father of the teenager accused of opening fire at a Georgia high school, killing four people and wounding nine, has been arrested on various charges including second-degree murder, authorities said Thursday.Colin Gray, 54, the father of Colt Gray, was 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 in a social media post. No other details were immediately provided, but a news conference was planned for later in the day.