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).
Movies & TV Shows
-
1408 (2007) — Lilly Enslin
-
Deep Impact (1998) — Andrea Baker
-
K-PAX (2001) — Rachel Powell
-
Miracle on 34th Street (1994) — Myrna Foy
-
ER (1994) — Debbie
-
True Crime (1999) — Michelle Ziegler
-
The Pitt (2025) — Dr. Linda Conley
-
The Newsroom (2012) — Molly Levy
-
Law & Order (1990) — Rickie the Bartender
-
Scandal (2012) — Lisa Elliot
-
The West Wing (1999) — Kate Harper
-
54 (1998) — New Year's Eve Wife (uncredited)
-
Private Parts (1997) — Alison Stern
-
Law & Order: Criminal Intent (2001) — Mary Shannon
-
Scooby-Doo! WrestleMania Mystery (2014) — Ms. Richards (voice)
-
Unpregnant (2020) — Debra Clarke
-
Fathers' Day (1997) — Virginia Farrell (uncredited)
-
Drone (2017) — Ellen
-
Mystery, Alaska (1999) — Donna Biebe
-
Vicious (2025) — Mother
-
Right at Your Door (2006) — Lexi
-
House of Lies (2012) — Denna Altshuler
-
Jimmy Kimmel Live! (2003) — Self
-
Dickie Roberts: Former Child Star (2003) — Grace Finney
-
For Your Consideration (2006) — Pilgrim Woman
-
The Ellen DeGeneres Show (2003) — Self
-
Heels (2021) — Willie Day
-
Gun Shy (2000) — Gloria Nesstra
-
Angie Tribeca (2016) — Abigail Liukin
-
The L Word: Generation Q (2019) — Anne Finley
-
The Late Late Show with Craig Ferguson (2005) — Self
-
Full Frontal (2002) — Linda
-
Late Night with Jimmy Fallon (2009) — Self
-
The Tonight Show with Jay Leno (1992)
-
In Plain Sight (2008) — Mary Shannon
-
The Broken Hearts Club: A Romantic Comedy (2000) — Anne
-
Will & Grace (2017) — Janet
-
Watch What Happens Live with Andy Cohen (2009) — Self - Guest
-
Treehouse (2019) — Lilith
-
Divorce (2016) — Kathy DeSantis