MSNBC:

Tim Russert, NBC News’ Washington bureau chief and the moderator of “Meet the Press,” died Friday after a sudden heart attack at the bureau, NBC News said Friday. He was 58.

Russert was recording voiceovers for Sunday’s “Meet the Press” program when he collapsed, the network said. No details were immediately available.

Russert, the recipient of 48 honorary doctorates, took over the helm of “Meet the Press” in December 1991. Now in its 60th year, “Meet the Press” is the longest-running program in the history of television.

In 2008, Time Magazine named him one of the 100 most influential people in the world.

This is truly upsetting. Tim, our thoughts are with your family.