Kitty is one of the Sisters in Brothers & Sisters. The others are Kevin,Tommy, Sarah and Justin. Their parents are Mr. and Mrs. William and Nora Walker. William died at a family reunion. After his death, Nora and her children discovered that he had had an affair with Holly Harper, who had born him a daughter, Rebecca Harper, in secret.Kitty worked as a radio host, then a conservative TV pundit, whom some compared to Ann Coulter. Kitty then started working for (and eventually married) Senator Robert McCallister.