He played a bad guy in the film “The Blind Side,” but IronE Singleton is anything but bad. The actor grew up in the Atlanta projects, where guns, drugs and hopelessness were pervasive. Yet he found his way out, graduating from the University of Georgia, where he played football. He plays T-Dog on AMC’s hit “The Walking Dead,” a zombie apocalypse series. Married with children, the 37-year-old is very spiritual. “The Walking Dead” returns to AMC on Feb. 12, at 9 p.m.