Difficult search for Adam Lanza's motive

Difficult search for Adam Lanza's motive

December 18, 2012 4:13 PM

In the Conn. elementary school shooting, the question that may never be answered is why Adam Lanza did what he did. As, justice correspondent Bob Orr reports, the killer did a good job of covering his tracks.

Motive remains unclear behind Newtown shooting
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