Officer who killed teen arrested for murder ADDISON, Texas — An off-duty suburban Dallas police officer who fatally shot a 16-year-old and wounded another juvenile was arrested Wednesday on charges of murder and aggravated assault, authorities said, while a funeral service for the teen was underway. Farmers Branch officer Ken Johnson was taken into custody Wednesday night by Addison police officers and was being booked into Dallas County Jail. The shooting happened Sunday evening at a gas station in Addison.