Tim Russert dies of an apparent heart attack.

Tim Russert dies of an apparent heart attack.

. He was 58.

Tim Russert collapsed at the NBC Washington news bureau and was pronounced dead shortly after, PEOPLE reports.
His former colleague and former NBC Nightly News anchor Tom Brokaw came on air at 3:39 p.m. to pay tribute to his late friend.

“Our beloved colleague...was one of the premier journalists of our time," Tom said. “This news division will not be the same without his strong, clear voice."

NBC is still in "shock" with grief, an insider tells OK!, and is at a loss with how to handle Sunday's broadcast.

"We will probably do a tribute show," the insider says.

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