Karen Ann Quinlan (March 29, 1954 – June 11, 1985) was an American woman who became an important figure in the history of the right to die controversy in the United States. When she was 21, Quinlan became unconscious after she consumed Valium along with alcohol while on a crash diet and lapsed into a coma, followed by a persistent vegetative state. After doctors, under threat from prosecutors, refused the request of her parents, Joseph and Julia Quinlan, to disconnect Quinlan's ventilator, which the parents believed constituted extraordinary means of prolonging her life, her parents filed suit to disconnect Quinlan from her ventilator.