From Variety [1]:

Suzanne Pleshette, the husky-voiced star best known for her role as Bob Newhart’s sardonic wife on television’s long-running “The Bob Newhart Show,” has died at age 70.

Pleshette, whose career included roles in such films as Hitchcock’s “The Birds” and in Broadway plays including “The Miracle Worker,” died of respiratory failure Saturday evening at her Los Angeles home, said her attorney Robert Finkelstein, also a family friend.

Pleshette underwent chemotherapy for lung cancer in 2006.

“The Bob Newhart Show, a hit throughout its six-year run, starred comedian Newhart as a Chicago psychiatrist surrounded by eccentric patients. Pleshette provided the voice of reason.