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