>> everyone in the office was on edge. >> my husband, i mean, he stayed up all night with a gun in his hand. >> i know that i started carrying a gun. sleep with a gun under my pillow. >> even shannon, who wouldn't carry a gun before, now slept with protection nearby. >> we had a big ol' shotgun sitting on our dresser ready to go just in case. >> the killer's threat to unleash more violence in kaufman county kept the task force working around the clock. a special team scoured the surveillance video collected near the mcclelland crime scene, hoping for a new lead. >> so many people now have surveillance cameras on their house. so, we're trained to go in and collect that sort of evidence. >> and, finally, the video team's painstaking search seemed to pay off. they found images of a car that didn't belong, a white ford crown victoria, cruising near the mcclelland home during the