star as Ersilla Drei in Pirandello's Naked at the Syracuse Stage, and performances in Ape Watch at the Mark Taper Forum Lab and in The Brides at the Lenox Art Centre soon followed. She appeared off-Broadway as Olive Lashbrook in The Voice of the Turtle, for which she received a very positive review in The New York Times, and in Scenes and Revelations. Film and television work O'Heaney appeared in the television movie The Seeding of Sarah Burns in 1979 and as waitress Lurleen Hamett in ABC's One Life to Live. She played the female lead, Amy, in the horror feature He Knows You're Alone (1980), which was Tom Hanks' first feature film. In 1982, she was cast in the lead female role of Sarah Stickney White in ABC's Tales of the Gold Monkey, also starring Stephen Collins, Roddy McDowall and Jeff MacKay. She also appeared as 1930s Hollywood actress Dolores Farrar in Woody Allen's 1983 film Zelig, and Allen would cast her again in The Purple Rose of Cairo in 1985. She played Miss Farmer in the 1987 film Three O'Clock High. Although she was active in television until 1993, O'Heaney did not appear in any feature films for nearly two decades, then returned in 2002 as Mrs. Woodbridge in The Emperor's Club with Kevin Kline, O'Heaney's colleague and friend at Juilliard. She also played Aunt Fran in the 2005 film Brooklyn Lobster, and most recently appeared in the 2007 independent feature Asylum Seekers. O'Heaney wrapped the feature film Late Phases, a thriller directed by Adrian Garcia Bogliano, in June 2013 in which she played the role of Emma. Other work and interests In the mid-1970s, Salvador Dalí offered Caitlin the opportunity to model for him, but Gala, his wife, was not in favor of the project so it was canceled. O'Heaney lists her interests as the environment, performing as an actress in theatre, film, television, animal rights, writing, music, singing, reading, and the design of fragrance. She used her interest in fragrance to create Caitlin, a cruelty-free fragrance containing gardenia, apple, sandalwood and patchouli. InStyle magazine reported that the fragrance was favored by Naomi Judd, Rosanna Arquette, Terri Hatcher and Paula Abdul. In 2006-2007, O'Heaney performed on radio with Air Pirates Radio Theater. In February 2008, she wrote the music and lyrics for an anti-war environmentalist song titled "Who Have We Freed?" which she recorded with Pete Seeger.