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).

Cast

K-PAX

Rachel Powell

1408

Lilly Enslin

High Heels and Low Lifes

Frances

The Big Tease

Monique

The Broken Hearts Club: A Romantic Comedy

Anne

Deep Impact

Andrea Baker

Private Parts

Alison Stern

Dickie Roberts: Former Child Star

Grace Finney

Gun Shy

Gloria Nesstra

Full Frontal

Linda

Mystery, Alaska

Donna Biebe

Right at Your Door

Lexi

Other Voices

Anna

Colin Fitz

Moira

For Your Consideration

Pilgrim Woman

54

New Year's Eve Wife (uncredited)

Fathers' Day

Virginia Farrell (uncredited)

East of A

Daphne

Harvest

Agent Becka Anslinger

The Alarmist

Sally

Should've Been Romeo

Ellen

Backfire!

Sarah Jackson

Escape from Polygamy

Leann

True Crime

Michelle Ziegler

A Country Called Home

Amanda

BigLove

Phoebe

The Crash

Sarah Schwab

An American Girl Story: Maryellen 1955 - Extraordinary Christmas

Kay Larkin

Madison

Bonnie McCormick

Scooby-Doo! WrestleMania Mystery

Ms. Richards (voice)

Vicious

Mother

Drone

Ellen

Alien Code

Rebecca

Treehouse

Lilith

Getting to Know You

Leila Lee

National Memorial Day Concert

Self

Still Laugh-In: The Stars Celebrate

Self

World Traveler

Margaret

Miracle on 34th Street

Myrna Foy

Unpregnant

Debra Clarke

The Unprofessional

Hilary Pfeiffer-Dunne

Murder One: Diary of a Serial Killer

Justine Appleton