Art Cashin, a renowned market pundit and the UBS director of floor operations at the New York Stock Exchange, has died at the age of 83, UBS said. Cashin, once dubbed "Wall Street's version of Walter Cronkite" by The Washington Post, was a regular on CNBC, delivering stock market commentary and analysis to the business news channel's viewers for more than 25 years. "It is with a heavy heart that I inform you of the passing of Arthur Cashin, Jr., a true giant in our industry," Bill Carroll, head of sales and development at UBS Wealth Management USA, said in a memo sent to employees on Monday.