The St. Louis native was 81. The cause of death was renal failure and pulmonary disease.
Ms. Bartlett graduated from John Burroughs School and Washington University. She was involved with the former St. Louis Community Playhouse, Rooftop Players and the old Empress Theater. She received her master's degree at the Graduate Drama School at Yale University.
Ms. Bartlett's Broadway credits include the Elia Kazan-directed production of Sweet Bird of Youth with Paul Newman and Geraldine Page (1959), Carson McCullers' The Square Root of Wonderful (1957), and Margaret Webster-directed revivals of Saint Joan (1951) and The Devil's Disciple (1950).
On film, she played Miss Metcalf in "Splendor in the Grass" and the secret wife in "I Never Promised You a Rose Garden."
In 1964, she was Emmy Award-nominated for outstanding performance in a supporting role for the television series "Arrest and Trial." In the 1976 television movie "Sybil," she played the role of Hattie, mother of Sally Field's title character, who suffered from multiple personality disorder.
Among Ms. Bartlett's TV credits are "Mission Impossible," "The Sixth Sense," "The Twilight Zone," "Manhunter," "Kojak" and "Cannon."
Survivors include a sister, Mary Jane Conrades of Chesterfield, MO, and a brother, Dan Bartlett Jr. of Webster Groves, MO.