'The Accountant' with Ben Affleck grows its cast

Cynthia Addai-Robinson, who plays Amanda Waller on the CW series "Arrow," has boarded the upcoming feature from Gavin O'Connor.

The actress will play a Treasury Department analyst, according to Variety, and will share the screen with Ben Affleck, Anna Kendrick ("Into the Woods"), J.K. Simmons ("Whiplash") and Jon Berenthal ("The Walking Dead," "Fury").

An assassin thriller, "The Accountant" focuses on a mild-mannered accountant who moonlights as a hit man.

Ben Affleck signed on in the title role last October, followed by Kendrick, Simmons and Berenthal the following month.

The feature is due to enter production in the near future, most likely as soon as Affleck wraps up on the set of "Batman V Superman: Dawn of Justice." The actor will then return to the director's chair to helm his fourth feature, "Live by Night," which is due to open in the US on October 7, 2016.

No release dates have been announced for "The Accountant."