The daughter of a United States Marine Corps officer,[3] she was raised in Haiti and the area around Washington, D.C.[1] Horton made her feature film debut in All My Sons in 1948, opposite Edward G. Robinson and Burt Lancaster[1] in a film based upon the play by Arthur Miller.

[1] She made her Broadway debut in 1946, playing the lead in the romantic comedy The Voice of the Turtle.

[1] Horton met her husband George Roy Hill when they were both actors in a Shakespeare repertory company.

[1] George Roy Hill, who was best known for directing the 1973's The Sting, an Oscar-winning film, as well as 1969's Butch Cassidy and the Sundance Kid, died in 2002.

Louisa Horton Hill died on January 25, 2008, at the Lillian Booth Actors' Fund Home in Englewood, New Jersey, aged 87.