03/13/2012 03:59 pm ET Updated May 13, 2012

What Role Did Accused Soldier's Brain Injury Play In Afghan Massacre?

It's incredibly difficult to surmise what might have pushed one American sergeant to allegedly massacre 16 Afghan civilians. But new details about the still-unnamed staff sergeant's background suggest that brain damage, wrought by a traumatic brain injury during an earlier deployment, might have been a contributing factor.

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