A sad note has been posted to the Weekly Standard:
It’s my sad duty to report that our good friend and valued contributor Dean Barnett passed away today. He was a remarkable man–principled, witty, and to all of us, a model of grace and courage. We mourn his passing and cherish his memory.
–William Kristol
This is a terrible loss for the Conservative movement. 
May he rest in peace.
Prayers and thoughts for his family this very sad day.
I never knew him personally. But he was a fellow Conservative.
I think this fits:
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