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On Tuesday evening, 65 year-old CNBC anchor Mark Haines unexpectedly died at home from an as-of-now unknown cause. The journalist, who most recently was the co-host of the morning show "Squawk on the Street," had been at the network for two decades and today CNBC is planning several on-air tributes to him.

Traders at the New York Stock Exchange had a moment of silence in his passing and his colleagues have eulogized him on Twitter. A light-hearted anecdote on the network's "In Memoriam" release notes that he was fondly remembered for giving nicknames like "The Brain," "The Kahuna," and "The Professor" to colleagues while on the air.

From CNBC President Mark Hoffman's statement:

"With his searing wit, profound insight and piercing interview style, he was a constant and trusted presence in business news for more than 20 years...From the dotcom bubble to the tragic events of 9/11 to the depths of the financial crisis, Mark was always the unflappable pro. "Mark loved CNBC and we loved him back. He will be deeply missed."


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