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Cynthia Addai-Robinson has joined Ben Affleck in the Warner Bros. thriller “The Accountant.”

Based on an original script by Bill Dubuque, “The Accountant” centers on a mild-mannered accountant (Affleck) who moonlights as a lethal assassin.

Robinson will play a Treasury Department analyst who has kept a low profile.

Anna Kendrick, J.K. Simmons and Jon Berenthal are also on board, with Gavin O’Connor directing.

Mark Williams and Lynette Howell are producing the “The Accountant,” which Drew Crevello and Jon Gonda will oversee for WB.

Best known for playing Amanda Waller on the CW’s “Arrow,” Robinson most recently worked on the History channel miniseries “Texas Rising.” She is repped by Liebman Entertainment & Innovative.