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Mary McCormack

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Person

Mary McCormack

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Mary Catherine McCormack (born February 8, 1969) is an American actress. She has had leading roles as Justine Appleton on the series Murder One (1995–1997), as Deputy National Security Adviser Kate Harper on The West Wing (2004–2006), as Deputy U.S. Marshal Mary Shannon on In Plain Sight (2008–2012), and as Peggy on the comedy series The Kids Are Alright (2018–2019).

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🎬 Filmography

Screen catalogue →

Vicious

2025 · as Mother

Heels

2021 · as Willie Day

Drone

2017 · as Ellen

Scooby-Doo! WrestleMania Mystery

2014 · as Ms. Richards (voice)

In Plain Sight

2008 · as Mary Shannon

1408

2007 · as Lilly Enslin

Full Frontal

2002 · as Linda

K-PAX

2001 · as Rachel Powell

Gun Shy

2000 · as Gloria Nesstra

Mystery, Alaska

1999 · as Donna Biebe

True Crime

1999 · as Michelle Ziegler

Deep Impact

1998 · as Andrea Baker

Private Parts

1997 · as Alison Stern

Murder One

1995 · as Justine Appleton