The series stars Sarah Michelle Gellar as Bridget, a recovering addict on the run from some unsavory people. She takes on her twin sister's identity after her sister apparently commits suicide. Miller will play Charlie, a blue-collar guy who Bridget meets at an Narcotics Anonymous meeting. She'll turn to him for help in coping with the stress of relapsing when Malcolm (Mike Colter), her previous sponsor, is unavailable.
The 31-year-old actor, who recently appeared on FX's Justified, will first appear in the fifth episode.
Ringer premieres Tuesday, Sept. 13 at 9/8c on the CW.