Elizabeth Ann Duncan, also known as Ma Duncan was convicted of planning the murder of her daughter-in-law in 1958. She was the last woman to be executed in California before the United States Supreme Court suspended the death penalty. Elizabeth Duncan was convicted of hiring 28 year-old Augustine Baldonado and 23 year-old Luis Moya to murder her daughter-in-law, who was pregnant at the time. The three prisoners were executed the same day in the gas chamber at San Quentin State Prison on August 8, 1962.