Adam Lanza autopsy mystery: His brain was not unusual

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We may never know the motive behind Adam Lanza’s shooting rampage.

That’s the word from Connecticut’s chief medical examiner tonight.

An autopsy of Lanza’s brain has revealed nothing unusual.

Meanwhile toxicology results won’t be in for weeks. Last month, Lanza gunned down 20 kids and 6 adults in Newtown.

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