I wonder if the attack was carried out in a similar fashion to the home invasion in "A Clockwork Orange". The criminals picked a remote, rural, residence as a target. The leader pounded on the door, claiming that there had been a terrible car crash on the road. I can see how JC would be conflicted, his natural suspicion at that late hour battling his desire to help, he might have opened the door a crack. I suspect the perp(s) was/were using shotguns. This would inflict a terrible head wound to JC (and might have caused the responding officers to suspect a suicide). With JC down, the attacker(s) kicked in the door, and shot the wife. The attacker(s) may have assumed she was dead, and proceeded to assault Jayme, the target. Mrs. Closs could have crawled into the bathroom and attempted to call 911, but, due to blood loss, she was unable to speak. This would account for the time-line discrepancy between the neighbors recollection of gunfire and the 911 call.