Tulloch played Marilyn Sitzman, a witness to the Kennedy assassination, in the star-studded 2013 film Parkland, opposite Paul Giamatti, Billy Bob Thornton, Marcia Gay Harden, Jacki Weaver, Jackie Earle Haley, and Zac Efron. The film was produced by Tom Hanks and Gary Goetzman of Playtone, and was released in 2013, to coincide with the 50th anniversary of John F. Kennedy's assassination.