A respected actress who brought both an endearing vulnerability and surprising intensity to many of her roles, Dillon began her career at the Goodman Theatre in Chicago and subsequently became an original member of the famed Second City improvisational company. She made her Broadway debut with an emotionally charged performance as Honey in the original Broadway production of "Who's Afraid of Virginia Woolf?" in 1962.

The petite blonde Dillon made her feature debut as an eccentric neighbor of Catherine Deneuve in "The April Fools" (1969). After a seven year absence, she returned to films in the