Mark Haines, who joined CNBC in 1989, died unexpectedly Tuesday night while at home, CNBC said.

The news of his death brought a halt to regular programming on CNBC this morning, and the New York Stock Exchange had a moment of silence to honor the news icon.

Haines was the host of CNBC's morning program Squawk Box before moving to Squawk on the Street.

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, Mark Hoffman, the president of CNBC, said in a statement to the network's employees.

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