Ruttan was born in Oregon City, Oregon, the daughter of Helen Manis, a nurse, and Daryl Dunrud, a logger. She graduated from University of Oregon and University of California, Santa Cruz.
Ruttan played Roxanne Melman on L.A. Law from 1986 to 1993. She reprised the role in 2002 for a TV reunion, L.A. Law: The Movie. She earned four nominations for Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series for her performance in show.
Ruttan first attracted significant attention playing the scheming wife of George Jefferson's dry-cleaning archrival, Gil Cunningham, on The Jeffersons. Other television appearances included episodes of Buffy the Vampire Slayer, AfterMash, Bosom Buddies, Third Rock from the Sun, Remington Steele, Yes, Dear, Newhart and Gilmore Girls. Buffy creator Joss Whedon cast numerous show alumni in 2008's Dr. Horrible's Sing-Along Blog, including Ruttan who appeared briefly in a non-speaking role.

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