CBS drama The Good Wife has added Jason O’Mara to its cast, Deadline has learned exclusively.

O’Mara will play Colin, a wild-eyed Irish attorney who has spent a decade successfully defending gang members and crime families. Now, he is looking for a home at a corporate law firm like Lockhart/Gardner where he clashes with the more conservative culture.

The CBS/CBS TV Studios legal drama has become a magnet for big-name reoccurring players, including Michael J. Fox, Matthew Perry, Maura Tierney, Nathan Lane, Gary Cole and Amanda Peet.

O’Mara is repped by UTA, Independent Talent and JTWAMM.