Colin Gray was found guilty of murder and manslaughter charges after his son, Colt Gray, allegedly killed four people in Georgia with an AR-15-style rifle that was kept inside their family's home. The Georgia jury deliberated for less than two hours before Colin, 55, was convicted on all 27 charges during a hearing on Tuesday, March 3. Colin has been found guilty of two counts of second-degree murder, two counts of involuntary manslaughter, 18 counts of cruelty to children and five counts of reckless conduct.