PHOTO: In the wake of the mass killings at Sandy Hook Elementary School, FRONTLINE investigates a young man, Adam Lanza (shown in 2005), who left behind a trail of death and destruction, but little else.
{"Image Copyright": "2005 Kateleen Foy/Getty Images\n\nImage may only be used in editorial conjunction with the direct promotion of this film in North America.  No other rights are granted.  All rights reserved."}