Kathryn was married to George Joosten. George Joosten was a psychiatrist and together they had two children. As a loving spouse, they have also been parents twice and they got divorced in 1980. Besides this married life there is no any information about her love affairs and boyfriend.
Kathryn began her acting career after she dissolved her married life with her ex husband George Joosten. Before that she was a psychiatric nurse and pursued this career till she was in her early 40s. In 1987, she portrayed the role of a waitress in the YV series Sable. In 1995, she appeared in the TV series like Pointman, Family Matters, Picket Fences and Grace Under Fire. She got her rise in game after she began starring the role of Dolores Landingham in the TV series The West Wing. Her breakthrough role as an actress came in 2004 when she began portraying the role of Karen McCluskey in the TV series Desperate Housewives. She earned the lucrative amount of salary as an actress and her net worth was 1.5 million before her death.
Kathryn was diagnosed of lung cancer in the late 1990s and she underwent surgery in 2001. She was found dead on 2nd of June 2012 and the cause of her death was lung cancer.