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