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).
★ 6 Vicious 2025
Mother Series ★ 8.7 The Pitt 2025
Dr. Linda Conley Series ★ 7.4 Heels 2021
Willie Day ★ 6.8 Unpregnant 2020
Debra Clarke ★ 5.5 Treehouse 2019
Lilith Series ★ 7.6 The L Word : Generation Q 2019
Anne Finley Series ★ 6.8 The Kids Are Alright 2018
Peggy Cleary Series ★ 7.2 For the People 2018
Chloe Daniels ★ 4.5 The Crash 2017
Sarah Schwab ★ 5.3 Drone 2017
Ellen ★ 5.4 Alien Code 2017
Rebecca Series ★ 6.4 Loaded 2017
Casey Series ★ 7.5 Will & Grace 2017
Janet ★ 5.3 A Country Called Home 2016
Amanda Series ★ 5.4 Chelsea Does 2016
Herself Series ★ 5.1 Chelsea 2016
Self Series ★ 6.5 Divorce 2016
Kathy DeSantis Series ★ 6.4 Angie Tribeca 2016
Abigail Liukin Series ★ 6.4 Match Game 2016
Self - Panelist ★ 7.3 Scooby-Doo ! et la folie du catch 2014
Ms. Richards (voice) ★ 6.7 Dans l'enfer de la polygamie 2013
Leann Series ★ 6.6 House of Lies 2012
Denna Altshuler Series ★ 7.2 Scandal 2012
Lisa Elliot Series ★ 8.1 The Newsroom 2012
Molly Levy Series ★ 4.9 Watch What Happens Live with Andy Cohen 2009
Self - Guest Series ★ 5.9 Late Night with Jimmy Fallon 2009
Self Series ★ 7 U.S. Marshals, Protection de témoins 2008
Mary Shannon ★ 6.7 Chambre 1408 2007
Lilly Enslin ★ 5.9 Los Angeles : Alerte maximum 2006
Lexi ★ 5.8 For Your Consideration 2006
Pilgrim Woman ★ 5.8 Madison 2005
Bonnie McCormick Series ★ 6.8 The Late Late Show with Craig Ferguson 2005
Self ★ 5.1 Dickie Roberts : Ex-enfant star 2003
Grace Finney Series ★ 5.6 The Ellen DeGeneres Show 2003
Self Series ★ 5.3 Jimmy Kimmel Live! 2003
Self ★ 4.6 Full Frontal 2002
Linda ★ 4.1 World Traveler 2002
Margaret ★ 7.2 K-Pax, l'homme qui vient de loin 2001
Rachel Powell ★ 6.1 Rouge à lèvres et arme à feu 2001
Frances Series ★ 7.6 New York Section Criminelle 2001
Mary Shannon ★ 6.3 Le Club des cœurs brisés 2000
Anne ★ 5.2 Mafia Parano 2000
Gloria Nesstra ★ 5.9 The Big Tease 1999
Monique ★ 6.3 Mystery, Alaska 1999
Donna Biebe ★ 6.5 Jugé coupable 1999
Michelle Ziegler Series ★ 8.3 À la Maison Blanche 1999
Kate Harper ★ 6.2 Deep Impact 1998
Andrea Baker ★ 5.9 Studio 54 1998
New Year's Eve Wife (uncredited) ★ 4.5 The Alarmist 1998
Sally ★ 6.5 Parties intimes 1997
Alison Stern ★ 5.5 Drôles de Pères 1997
Virginia Farrell (uncredited) Series ★ 7.7 Murder one : L'affaire Rooney 1995
Justine Appleton ★ 6.8 Miracle sur la 34e rue 1994
Myrna Foy Series ★ 7.8 Urgences 1994
Debbie Series ★ 5.4 The Tonight Show with Jay Leno 1992
Series ★ 7.3 New York Police Judiciaire 1990
Rickie the Bartender 
