Below is the letter from CNBC President, Mark Hoffman:
It is with deep regret and a heavy heart that I let you know that Mark Haines passed away last night in his home.
I know all of you join me in sending our heartfelt condolences to Mark's wife, Cindy, his son, Matt, and his daughter, Meredith.
Mark has been one of the building blocks of CNBC since the very beginning, joining us in 1989. 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.
When we have details on the arrangements, I will communicate them to you.