Mark Haines Mark Haines

Longtime CNBC anchor Mark Haines has died, the financial network reported Wednesday. He was 65.

He died unexpectedly at his home Tuesday night, according to CNBC, which did not offer a cause of death.

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CNBC President Mark Hoffman called Haines a "building block" of the network. "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," Hoffman said in a statement to CNBC employees. "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."

Haines joined CBNC in 1989 after working at stations in Philadelphia, New York and Providence, R.I. He was the founding anchor of CNBC's morning show Squawk Box, and co-anchor of Squawk on the Street.

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Traders at the New York Stock Exchange paused for a moment of silence, and condolences and reactions poured in, CNBC said.

Dave Lutz, managing director of trading at Stifel Nicolaus, recalled the "Haines bottom," as it was called by Haines' former broadcast partner, Erin Burnett. Haines called the financial crisis market bottom on March 10, 2009, just a day after the market did, in fact, stopped sinking. "Nice call, Mark. RIP," Lutz wrote in an e-mail to clients.

Haines is survived by wife Cindy, daughter Meredith and son Matt.