Miller (elbow) underwent Tommy John surgery Wednesday, Steve Gilbert of MLB.com reports.
Miller will now begin a long recovery process with the hopes of returning to the mound for the Diamondbacks some time near the end of next summer. Manager Torey Lovullo said that he expects Miller to miss about 15 months, but that timetable could be adjusted once the right-hander draws closer to throwing. Zack Godley was recalled from Triple-A Reno on Wednesday and figures to assume Miller's spot in the rotation for the foreseeable future.