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).
2009 • TV
1990 • TV
2005 • TV
1999 • TV
2007 • Movie
2025 • Movie
as Lilly Enslin
as Mother
as Anna
as Linda
as Andrea Baker
as Donna Biebe
as Pilgrim Woman
as Lilith
as Agent Becka Anslinger
as Ellen
as Rachel Powell
as Monique
as Myrna Foy
as Bonnie McCormick
as Gloria Nesstra
as Michelle Ziegler
as Virginia Farrell (uncredited)
as Debra Clarke
as Sarah Jackson
as New Year's Eve Wife (uncredited)
as Self - Guest
1 episodes
as Rickie the Bartender
1 episodes
as Self
2 episodes
as Kate Harper
48 episodes
as Mary Shannon
1 episodes
as Debbie
6 episodes
as Self - Nominee
1 episodes
as Lisa Elliot
1 episodes
1 episodes
as Molly Levy
2 episodes
as Mary Shannon
61 episodes
as Self
1 episodes
as Self
1 episodes
as Abigail Liukin
3 episodes
as Self
2 episodes
as Self - Panelist
1 episodes
as Janet
2 episodes
as Self
26 episodes
17 episodes
as Mary McCormack
1 episodes
