know is, why did this happen? >> reporter: shortly after 11:00 a.m. sunday morning, devin kelley, armed with a military-style rifle and two handguns, parked at this gas station and crossed the street to the first baptist church. at 11:20 a.m., death barged into the church service. kelley murdering his way to the front of the shoebox-sized church, seen here in video of past services with those tightly packed pews. ♪ stand up for jesus >> reporter: and then, shooting his way back out. >> it was dozens of rounds. >> reporter: which means he must have had time to reload. >> oh, yeah. >> reporter: almost no one was spared. >> all available personnel. >> reporter: police were on their way, but neighbors were already there. >> a local resident grabbed his rifle and engaged that suspect. >> reporter: that citizen, stephen willeford, hitting kelley. willeford then got more help from another citizen, johnnie langendorf. >> he said, chase him, so, that's what i did. i just chased him. >> reporter: jolting down a country road at over 90 miles an hour, during which, police say, the shooter called his father.