Todd Helton (back) is unlikely to return to the Rockies' starting lineup before the end of the season. Helton hasn't played since last Tuesday because of back pain. An MRI taken this week showed no serious structural damage, but the 38-year-old veteran first baseman is still dealing with a good amount of discomfort. He batted .302/.385/.466 with 14 homers and 69 RBI in 124 games this year.