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crime. but who is he? what kind of family did he come from? and what made him finally snap? we have the inside story. single but deadly. they are ready to murder. but they brood alone, prepare alone and act alone so how do you stop them? "nightline" investigates the phenomenon of the lone wolf. and the freezing south. a fierce storm leaves dixie blanketed and shivering. chaos on roads and runways. we'll tell you where it's headed next. good evening. i'm bill weir. it is part of the human condition to seek rationale explanations for the most irrational of crime. emptying a glock int...

good evening. i'm bill weir. it is part of the human condition to seek rationale explanations for the most irrational of crime. emptying a glock into the crowd of innocents goes against logic but we have to try to understand. what was the nature of loughner's apparent sickness? who could have stopped him? those are the questions out of tucson. here is david wright with the very latest clues. >> reporter: the first glimpse of jared lee loughner since his arrest, a mug shot released today. head shaved. eyes bright. on his lips, the hint of a smile. shortly after his arrest for mass mur...