EXCLUSIVE: After a lengthy search, Prime Suspect co-star Damon Gupton has been cast as the lead in AMC’s untitled Richard LaGravenese/Tony Goldwyn project. Written by LaGravenese and to be directed by Goldwyn, the ensemble drama is a legal thriller centered on Adam Page (Gupton), a District Attorney who uncovers new evidence that prompts the reinvestigation of a sensational murder case. Marin Ireland plays the female lead. Gupton, repped by SMS Talent in LA and Harden/Curtis in NY, recently guest starred in the Bullies episode of HBO’s Newsroom.