Adam Arkin Adam Arkin

Former Chicago Hope and Sons of Anarchy star Adam Arkin will guest-star on the upcoming season of The Closer, has learned exclusively.

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Arkin will play Steven Hirschbaum, a Bernie Madoff-like businessman who is convicted in a massive federal fraud trial and is being sued by the former employees and investors from whom he stole. The question troubling Deputy Chief Brenda Leigh Johnson (Kyra Sedgwick

): Just how far will those angry investors go to exact their revenge?This marks Arkin's first appearance on The Closer — at least in front of the camera. He directed an episode in 2009.

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Besides playing white separatist gang leader Ethan Zobelle on Sons of Anarchy and as Dr. Aaron Shutt on Chicago Hope, Arkin, 54, has starred on such shows as Life and 8 Simple Rules. He has also guest-starred on Monk, The West Wing and, most recently, The Chicago Code — a role he will reprise in that show's season finale.The Closer returns Monday, July 11 at 9/8c on TNT. Arkin's episode, "To Serve with Love," does not yet have an airdate.