Synopsis:
Katie Couric hosts a special "48 Hours" focusing on the Virginia Tech Massacre. Bob Orr looks at how investigators pieced together to determine who the killer was and looks and how they are piecing together information about him to determine what caused him to gun down the school. Erin Moriarty interviews the owner of the gun shop where Cho Seung-Hui purchased the gun. Peter Van Sant puts together the time line of the events and Katie Couric covers the the special memorial service at Virginia Tech.
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