Go inside the investigation into one of the worst school shooting massacres in U.S. history.
No clear motive was spelled out in the 44-page summary of the investigation into last year's massacre at Sandy Hook Elementary School that was released Monday. However, new photographs of the scene -- and shooter Adam Lanza's home -- were released. Here is a sampling:
Giuseppe Bellini/Getty Images
The Walt Disney Company, All Rights Reserved
iStock / crisserbug
Courtesy USA Swimming
Ethan Miller/Getty Images
American Kennel Club via CNN
Ben A. Pruchnie/Getty Images for Walt Disney Studios
Library of Congress [Public domain], via Wikimedia Commons
Frazer Harrison/Getty Images
Darren McCollester/Getty Images
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