A father and son were indicted on murder charges Thursday in a mass shooting at Apalachee High School in Winder, Georgia, last month. The big picture: Accused shooter Colt Gray, 14, was formally charged with 55 counts in connection with the shooting that killed four people and injured nine others,

A 14-year-old boy and his father charged in the deadly shooting at a Georgia high school last month were formally indicted by a grand jury Thursday on dozens of additional charges, a day after investigators revealed new troubling details about the attack.

A grand jury on Thursday indicted accused Georgia school mass shooter Colt Gray and his father Colin on dozens of charges arising from the Sept. 4 shooting deaths and injuries.