Marc Warren, Maura Tierney Marc Warren, Maura Tierney

Band of Brothers' Marc Warren and ER alum Maura Tierney are joining The Good Wife in two key roles, has confirmed. TVLine first reported the news.

Warren will play Kalinda's mysterious and menacing husband Nick, from whom she fled and changed her identity way back when. At the end of Season 3, Kalinda (Archie Panjabi) was locked and loaded in front of the door waiting for her husband to return. Warren, a Brit, is best known in the U.K. for his work on Hustle, State of Play and Mad Dogs.

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Tierney will recur in as many as 10 episodes as Maddie, a self-made billionaire who started her own Internet company and is the doyenne of Chicago Democratic politics. Eli (Alan Cumming

) pursues her support for Peter's campaign to become governor.

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The gig will mark an ER reunion for Tierney and Julianna Margulies. Tierney's Abby Lockhart was introduced in Season 6 of the medical drama — during which she helped Margulies' Carol Hathaway give birth — and eventually replaced Margulies as the show's female lead following her exit at the end of the season.Tierney has since appeared on Rescue Me and The Office. She also starred on ABC's short-lived The Whole Truth.Season 4 of The Good Wife returns this fall on Sundays at 9/8c on CBS.