The 63-year-old actor will play attorney Robert Boseman, who begins poaching Diane's (Christine Baranski) associates and clients when she gets into financial trouble, reported Entertainment Weekly.
"Boseman is a character who dominates every scene, intimidates every lawyer, and is beloved by every client.
"He needs to look like a Chicago lawyer, but have a Shakespearean facility with language, and Delroy Lindo was really the only actor who came to mind," executive producers and showrunners Robert and Michelle King said.
Lindo has previously starred in a series of short-lived shows, "The Chicago Code", "Believe" and "Blood & Oil".
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