Rockies icon Helton to retire after the season

Denver Broncos running back Knowshon Moreno (27) rushes past New York Giants linebacker Mathias Kiwanuka as teammate Ryan Clady (78) blocks for him during the first half of an NFL football game Sunday, Sept. 15, 2013, in East Rutherford, N.J. (AP Photo/Kathy Willens)
Denver Broncos running back Knowshon Moreno (27) rushes past New York Giants linebacker Mathias Kiwanuka as teammate Ryan Clady (78) blocks for him during the first half of an NFL football game Sunday, Sept. 15, 2013, in East Rutherford, N.J. (AP Photo/Kathy Willens)
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