Mary McCormack
Biography
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
TV
Watch What Happens Live with Andy Cohen
Self - Guest
2009
TV
Law & Order
Rickie the Bartender
1990
TV
The Late Late Show with Craig Ferguson
Self
2005
TV
Law & Order: Criminal Intent
Mary Shannon
2001
TV
Will & Grace
Janet
2017
TV
The West Wing
Kate Harper
1999
TV
ER
Debbie
1994
TV
The Tonight Show with Jay Leno
1992
TV
Scandal
Lisa Elliot
2012
TV
The Ellen DeGeneres Show
Self
2003
TV
25 Words or Less
Self
2018
TV
25 Words or Less
2018
TV
25 Words or Less
Mary McCormack
2018
TV
Chelsea
Self
2016
TV
Angie Tribeca
Abigail Liukin
2016
TV
Match Game
Self - Panelist
2016
TV
In Plain Sight
Mary Shannon
2008
TV
Late Night with Jimmy Fallon
Self
2009
TV
The Newsroom
Molly Levy
2012
TV
To Tell the Truth
Self - Panelist
2016
Filmography
2025FilmViciousas Mother2023FilmNational Memorial Day Concertas Self2021TVHeelsas Willie Day2020FilmUnpregnantas Debra Clarke2019TVThe L Word: Generation Qas Anne Finley2019FilmStill Laugh-In: The Stars Celebrateas Self2019FilmTreehouseas Lilith2018TVThe Kids Are Alrightas Peggy Cleary2018TV25 Words or Lessas Self2018TVFor the Peopleas Chloe Daniels2017TVWill & Graceas Janet2017FilmDroneas Ellen2017TVLoadedas Casey2017FilmAlien Codeas Rebecca2017FilmThe Crashas Sarah Schwab2016FilmAn American Girl Story: Maryellen 1955 - Extraordinary Christmasas Kay Larkin2016TVDivorceas Kathy DeSantis2016TVMatch Gameas Self - Panelist2016TVTo Tell the Truthas Self - Panelist2016TVChelseaas Self2016FilmA Country Called Homeas Amanda2016TVChelsea Doesas Herself2016TVAngie Tribecaas Abigail Liukin2014FilmScooby-Doo! WrestleMania Mysteryas Ms. Richards (voice)2013TVWelcome to the Familyas Caroline Yoder2013FilmEscape from Polygamyas Leann2012TVThe Newsroomas Molly Levy2012FilmShould've Been Romeoas Ellen2012TVScandalas Lisa Elliot2012TVHouse of Liesas Denna Altshuler2012FilmThe Unprofessionalas Hilary Pfeiffer-Dunne2009TVWatch What Happens Live with Andy Cohenas Self - Guest2009TVLate Night with Jimmy Fallonas Self2008TVIn Plain Sightas Mary Shannon2007Film1408as Lilly Enslin2006FilmFor Your Considerationas Pilgrim Woman2006FilmRight at Your Dooras Lexi2005FilmMadisonas Bonnie McCormick2005TVThe Late Late Show with Craig Fergusonas Self2004TVTrafficas Carole McKay2003TVK Streetas Maggie Morris2003TVThe Ellen DeGeneres Showas Self2003FilmDickie Roberts: Former Child Staras Grace Finney2002FilmFull Frontalas Linda2002FilmWorld Traveleras Margaret2001FilmK-PAXas Rachel Powell2001TVLaw & Order: Criminal Intentas Mary Shannon2001FilmHigh Heels and Low Lifesas Frances2001FilmBigLoveas Phoebe2000FilmEast of Aas Daphne2000FilmGun Shyas Gloria Nesstra2000FilmThe Broken Hearts Club: A Romantic Comedyas Anne2000FilmOther Voicesas Anna1999FilmThe Big Teaseas Monique1999FilmMystery, Alaskaas Donna Biebe1999TVThe West Wingas Kate Harper1999TVThe Late Late Show with Craig Kilbornas Self - Guest1999FilmTrue Crimeas Michelle Ziegler1999FilmHarvestas Agent Becka Anslinger1999FilmGetting to Know Youas Leila Lee1998FilmThe Alarmistas Sally1998Film54as New Year's Eve Wife (uncredited)1998FilmDeep Impactas Andrea Baker1997FilmMurder One: Diary of a Serial Killeras Justine Appleton1997FilmFathers' Dayas Virginia Farrell (uncredited)1997FilmPrivate Partsas Alison Stern1997FilmColin Fitzas Moira1995TVMurder Oneas Justine Appleton1995TVThe Wright Verdictsas Beth Eckhart1995FilmBackfire!as Sarah1994FilmMiracle on 34th Streetas Myrna Foy1994TVERas Debbie1992TVThe Tonight Show with Jay Leno1990TVLaw & Orderas Rickie the Bartender