U.S. stocks ended Tuesday's choppy session lower, as investors appeared to take a pause in a day light on economic data releases. Energy and materials stocks led the losses on the S&P 500 , while all ten main sectors finished lower. The benchmark index ended the day 9.55 points, or 0.5%, lower at 1,867.62. The Dow Jones Industrial Average closed 67.43 points, or 0.4%, lower at 16,351.25. The Nasdaq Composite fell for the fourth consecutive day, ending down 27.26 points, or 0.6%, at 4,307.19