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:
Omar Havana/Getty Images
Alex Wong/Getty Images
Daniel Berehulak/Getty Images
Ethan Miller/Getty Images for Michael Jordan Celebrity Invitational
Tim Boyle/Getty Images
Jon Durr/Getty Images
Alberto E. Rodriguez/Getty Images
Cantor Fitzgerald/ Getty
Sign up for Breaking News, Daily Headlines, Severe Weather Alerts & more!