Mary Anne "Mamie" Cadden (27 October 1891 – 20 April 1959) was an Irish midwife, backstreet abortionist, and convicted murderer. She was born 27 October 1891 in Scranton, Pennsylvania, to Irish parents Patrick and Mary Cadden. In 1895, Cadden and her family returned to Lahardane in County Mayo, Ireland, where she completed years of schooling. Once she obtained her spot on the list of licensed midwives in Dublin, she opened a series of maternity nursing homes to aid women with health issues and to perform illegal abortions. After a series of criminal convictions, Cadden lost her status as a licensed midwife. In 1944, Cadden was charged and convicted for the murder of 33-year-old Helen O'Reilly. She was sentenced to life in prison, and after a year at Mountjoy prison, she was declared insane