May was placed on the 15-day DL with a setback to his back injury and will miss the rest of the season, Rhett Bollinger of MLB.com reports.
May gave up two runs while retiring one batter Sunday in his return from the DL. May's back troubles contributed to a lost season as he finishes with a 5.27 ERA and 1.5 HR/9. May was a candidate to take over the closer role, but it's possible he could be moved back to the rotation in 2017. However, he'll have to show he's healthy before he wins any role.