Morris' first role was a minor one in the 1991 tele-movie Long Road Home. Several other small parts followed, including a bit part as a psychiatric patient in the Oscar-winning As Good as It Gets. Her breakthrough role came as Lt. Annalisa "Stinger" Lindstrom in the television series Pensacola: Wings of Gold in 1997. She played it for two seasons. Morris continued to work in films (notably ones directed by Rod Lurie) and had a brief stint on the Xena series in 1999.

After seeing her in the film The Contender, which Dreamworks distributed, Steven Spielberg cast her in two successive films, but her scenes as a rock star in A.I.: Artificial Intelligence which required her to take singing and guitar lessons were cut by the director while the next production, Minority Report, was filming. In the latter, she portrayed the tormented wife of Tom Cruise's character.

In 2003, Morris won the lead role of detective Lilly Rush in the CBS dramatic series Cold Case in which she plays a passionately concerned but relationship-shy detective assigned to solving murders that frequently are decades old. The actress also appeared in the 2004 films Mindhunters and Paycheck.

Most sources report Morris was born in Cincinnati, Ohio (though CBS News identifies her birthplace as Dallas). She was raised in the Church of Christ in Windsor Locks, Connecticut, and toured the country in the family's singing group, Morris Code, along with her 6 other siblings. Some people call her Kathy. She attended two colleges in the Philadelphia area, including Temple University.

She lives in Los Angeles, California. In 2003, she was briefly engaged to Randy Hamilton, a financial advisor. She is currently dating David Barrett, a director and producer who has worked on Cold Case.

• Resurrecting the Champ (2007) .... Joyce
• Mindhunters(2004) .... Sara Moore
• Paycheck(2003) .... Rita Dunne
• The Hire: Hostage(2002) .... Linda Delacroix (The Hostage) (one of the BMW films)
• Minority Report(2002) .... Lara Anderton
• Role of a Lifetime(2001) .... Chelsea
• The Last Castle(2001) .... DOD investigator (scenes deleted)
• A.I.: Artificial Intelligence(2001) .... Teenage Honey (scenes deleted)
• And Never Let Her Go (2001) (TV) .... Anne Marie Fahey
• The Contender(2000) .... Special Agent Paige Willomina
• Murder, She Wrote: A Story to Die For (2000) (TV) .... Patricia Williams
• Hell Swarm(2000) (TV)
• Deterrence(1999) .... Lizzie Woods
• Screenplay (1999)
• Inherit the Wind(1999) (TV) .... Rachel Brown
• Inferno (1998) (TV) .... Ryan Tibbet
• The Prophecy II (1998) (V) .... Anxious Mother
• Pensacola: Wings of Gold(1997) TV Series .... 1st Lt. Annalisa Lindstrom (1997-1998)
• As Good as It Gets(1997) .... Psychiatric Patient
• The Prince(1996/I) .... Emily
• Sleepstalker(1995) .... Megan
• Family Values(1995) (TV) .... Borgyork Grumm
• W.E.I.R.D. World(1995) (TV) .... Lucy, Monochian's Assistant
• A Friend to Die For(1994) (TV) .... Monica
• Sweet Justice(1994) TV Series .... Remy
• Oldest Living Confederate Widow Tells All (1994) (TV) .... Zundro (Sandra)
• Rise and Walk: The Dennis Byrd Story (1994) (TV) .... Angela
• Double Cross(1992) .... Andy
• Cool as Ice(1991) .... Jen
• Long Road Home(1991) (TV) .... Billy Jo Robertson