Early in her career, (when she was still known as Merle Letowt), she played "Thelma" in the original cast of Gypsy (1959). Eventually, she moved up to the lead role of "Dainty June", playing it for much of the Broadway run and on the first national tour.[1]
Louise returned to Broadway in Company (1970) as "Susan". Her biggest success was as "the Beggar Woman" in Sweeney Todd: The Demon Barber of Fleet Street (1979), for which she won the Drama Desk Award as Outstanding Featured Actress in a Musical.[2] However, her "ravaging crazy"[3] performance is not preserved in the video recording as she was not a member of the national tour that was videotaped.[4]
The cast of the Broadway show, title of show (along with some of their theatrical friends), created a game based around Merle Louise, entitled "Six Degrees of Merle Louise", which is based on Six Degrees of Kevin Bacon except that it generally uses Broadway musicals in place of movies to link two performers.[7]
On-camera and later career
Louise's on-camera work has been limited, most notably appearing in the televised production of Into the Woods and a documentary about the recording of the Original Cast Album of Company. She has had some guest appearances on shows such as Law & Order.[8]