Mary McCormack
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).
77 acting credits
Acting · 77
Law & Order
1990
Watch What Happens Live with Andy Cohen
2009
Law & Order: Criminal Intent
2001
ER
1994
The Pitt
2025
The West Wing
1999
Scandal
2012
The Late Late Show with Craig Ferguson
2005
Jimmy Kimmel Live!
2003
Tony Awards
1956
The Ellen DeGeneres Show
2003
The Tonight Show with Jay Leno
1992
The Newsroom
2012
Murder One
1995
In Plain Sight
2008
Chelsea
2016
25 Words or Less
2018
Angie Tribeca
2016
House of Lies
2012
To Tell the Truth
2016
Will & Grace
2017
Match Game
2016
Late Night with Jimmy Fallon
2009
Heels
2021
Divorce
2016
For the People
2018
The L Word: Generation Q
2019
The Late Late Show with Craig Kilborn
1999
Deep Impact
1998
1408
2007
K-PAX
2001
K Street
2003
Vicious
2025
The Kids Are Alright
2018
Traffic
2004
Miracle on 34th Street
1994
True Crime
1999
Welcome to the Family
2013
54
1998
The Wright Verdicts
1995
Mystery, Alaska
1999
For Your Consideration
2006
Private Parts
1997
Dickie Roberts: Former Child Star
2003
Unpregnant
2020
Gun Shy
2000
The Broken Hearts Club: A Romantic Comedy
2000
Scooby-Doo! WrestleMania Mystery
2014
Loaded
2017
Fathers' Day
1997
Drone
2017
Full Frontal
2002
High Heels and Low Lifes
2001
The Crash
2017
Treehouse
2019
The Alarmist
1998
Madison
2005
Alien Code
2017
The Big Tease
1999
Chelsea Does
2016
Right at Your Door
2006
Colin Fitz
1997
Escape from Polygamy
2013
Still Laugh-In: The Stars Celebrate
2019
World Traveler
2002
Harvest
1999
Should've Been Romeo
2012
Getting to Know You
1999
Other Voices
2000
Backfire!
1995
Murder One: Diary of a Serial Killer
1997
A Country Called Home
2016
An American Girl Story: Maryellen 1955 - Extraordinary Christmas
2016
National Memorial Day Concert
2023
BigLove
2001
East of A
2000
The Unprofessional
2012