Statement from NBC News president Steve Capus:

This is a loss for the entire nation. Everyone at NBC News is in shock and absolutely devastated. He was our respected colleague, mentor, and dear friend. Words can not express our heartbreak. Our thoughts and prayers are with Maureen, Luke, Big Russ and all of Tim's family.

Jeff Zucker, Steve Capus, Maureen Orth and Tim Russert on the receiving line at the Meet the Press 60th Anniversary party last November. (photo: TVNewser/Alissa Krinsky)