Her death was announced by her son, the actor John Carlin, on Instagram.
The curtain goes down on a life so richly, passionately, humbly and generously lived.
See Carlins Instagram post below.

Frances Sternhagen (2013)Daniel Zuchnik/Getty Images
She earned Tony nominations for all five of those shows.
She studied acting at the Perry Mansfield School of the Theatre and New York Citys Neighborhood Playhouse.
A celebration of her career and life will be planned for mid-January.

Frances Sternhagen and John Ratzenberger on ‘Cheers’ in 1986Paramount Television/Everett Collection