Estelle Louise Fletcher, known professionally as Louise Fletcher, is an American actress. She had her acting debut in the television series 77 Sunset Strip in the 1957/58 season. She guest starred in the television series Bat Masterson (episode "Cheyenne Club"), Maverick (episode "The Saga of Waco Williams") with James Garner, and Wagon Train in 1959 before making her film debut in A Gathering of Eagles in 1963. In 1974, after a decade-long hiatus from acting in which she raised a family, Fletcher appeared in Robert Altman's Thieves Like Us. Fletcher garnered international prominence with her portrayal of Nurse Ratched in One Flew Over the Cuckoo's Nest (1975), for which she won the Academy Award for Best Actress, BAFTA Award for Best Actress in a Leading Role and Golden Globe Award for Best Actress. Other notable film roles include Exorcist II: The Heretic (1977), Brainstorm (1983), Firestarter (1984), Flowers in the Attic (1987), 2 Days in the Valley (1996), and Cruel Intentions (1999). Later in her career, Fletcher returned to television, appearing as Winn Adami in Star Trek: Deep Space Nine (1993–1999), as well as receiving Primetime Emmy Award nominations for her guest-starring roles in the television series Picket Fences (1996) and Joan of Arcadia (2004). In 2011–2012, she appeared in a recurring role on the television series Shameless as Frank Gallagher's foul-mouthed and hard-living mother who is serving a prison sentence for manslaughter. She portrayed the recurring role of Rosie on the series Girlboss (2017).