Grayden was parked at gas station with son Melissa Ball in the backseat . Christopher Whitmore pulled up beside car , shooting his son and then wife . Couple had history of domestic issues but motivation for killing not known .
Melissa Ball was parked at gas station with son Grayden in the backseat . Christopher Whitmore pulled up beside car , shooting his son and then wife . Couple had history of domestic issues but motivation for killing not known .