DeWayne Craddock took a moment to brush his teeth at work, as he always did, on Friday before killing 12 people and wounding four others at the Virginia Beach Municipal Center, a co-worker recalled. Joseph Scott, an engineering technician, said he exchanged pleasantries with the quiet, 40-year-old certified professional engineer for the city in the bathroom shortly before the carnage. "I said, 'How are you doing?' He said he was doing OK," Scott remembered. "I asked, 'Any plans for the weekend?' And he said, 'No.' I said, 'Well, have a good day.' And he said the same to me." Scott went home...