and there's surveillance video of that. a big focus of the ongoing investigation right now is centered here. as you touched on earlier, nbc news has learned exclusive details through our investigative unit about how they tracked conditt down. first, those exotic batteries that were ordered online from asia helped to tie all the attacks together. next, cell site analysts closed in on his cell phone number. he used that cell phone hours before he was cornered by police. finally, that surveillance video from the austin fedex, it was the lynch pin, it was the final thing that let them know they were focused on this primary suspect. he was wearing a hat and blond wig in that video, but they knew exactly who they were after here, kasie. unfortunately it ended the way it did but a lot of people across the region right now