Sandy Hook's Chilling Final Chapter

Almost a year after Adam Lanza murdered 20 children and six adults at Sandy Hook Elementary school in Newtown, Conn., a dark mystery remains at the heart of the horror: motive. A 48-page report released Nov. 25 by the Danbury state's attorney provides a granular look at the event and the disturbing life Lanza led in the years that preceded it. What it doesn't offer is an answer to the hardest question of all: why the 20-year-old chose to kill.

In hindsight, the warning signs are clear: the spreadsheet he kept chronicling mass killings, videos documenting suicide by gunshot, a fifth-grade...

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