Erin O'Brien (January 17, 1934 – May 20, 2021) was an American actress and singer, active during the mid-twentieth century and best known as the leading lady of arguably the first made-for-TV movie in 1958,[citation needed] Girl on the Run, which also served as the pilot for the television series 77 Sunset Strip written by Roy Huggins and starring Efrem Zimbalist Jr., which played briefly in theaters before airing on television on October 10, 1958.

Following that work, O'Brien toured as a singer and eventually became a winner on Arthur Godfrey's Talent Scouts on television, which led to a one-year contract on The Tonight Show.

[4][1] During the late 1950s and 1960s, O'Brien also performed as a supporting character and leading lady in episodes of a variety of television shows, including many popular Western series.

Some of those series include Bat Masterson, Sugarfoot, Cheyenne, Maverick, Colt .45, Laramie, Tombstone Territory, and Death Valley Days.

[1] Earlier, casting directors considered her as a potential costar for Gene Kelly in Marjorie Morningstar (1958), but she was deemed too tall for her co-star, so the role was given to Natalie Wood.