Mary McCormack
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Mary Catherine McCormack 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).
Known for
Credits
Deep Impact (1998)
as Andrea Baker
K-PAX (2001)
as Rachel Powell
Vicious (2025)
as Mother
1408 (2007)
as Lilly Enslin
Private Parts (1997)
as Alison Stern
Drone (2017)
as Ellen
Full Frontal (2002)
as Linda
Gun Shy (2000)
as Gloria Nesstra
Miracle on 34th Street (1994)
as Myrna Foy
Treehouse (2019)
as Lilith
The Unprofessional (2012)
as Hilary Pfeiffer-Dunne
Backfire! (1995)
as Sarah
True Crime (1999)
as Michelle Ziegler
For Your Consideration (2006)
as Pilgrim Woman
Scooby-Doo! WrestleMania Mystery (2014)
as Ms. Richards (voice)
BigLove (2001)
as Phoebe
Dickie Roberts: Former Child Star (2003)
as Grace Finney
54 (1998)
as New Year's Eve Wife (uncredited)
Right at Your Door (2006)
as Lexi
Mystery, Alaska (1999)
as Donna Biebe
The Broken Hearts Club: A Romantic Comedy (2000)
as Anne
Fathers' Day (1997)
as Virginia Farrell (uncredited)
National Memorial Day Concert (2023)
as Self
High Heels and Low Lifes (2001)
as Frances
Unpregnant (2020)
as Debra Clarke
The Crash (2017)
as Sarah Schwab
The Big Tease (1999)
as Monique
Still Laugh-In: The Stars Celebrate (2019)
as Self
An American Girl Story: Maryellen 1955 - Extraordinary Christmas (2016)
as Kay Larkin
Alien Code (2017)
as Rebecca
Should've Been Romeo (2012)
as Ellen
Madison (2005)
as Bonnie McCormick
Murder One: Diary of a Serial Killer (1997)
as Justine Appleton
Harvest (1999)
as Agent Becka Anslinger
Escape from Polygamy (2013)
as Leann
The Alarmist (1998)
as Sally
A Country Called Home (2016)
as Amanda
Colin Fitz (1997)
as Moira
Getting to Know You (1999)
as Leila Lee
Other Voices (2000)
as Anna
World Traveler (2002)
as Margaret
East of A (2000)
as Daphne