Devine had suffered from chronic bronchitis for 20 years, and died of cancer, aged 70 at the Concord Repatriation Hospital in Sydney on 24 November 1970. Her funeral service was held at the Sacred Heart Catholic Church, Darlinghurst. She was cremated at Botany Crematorium, now known as Eastern Suburbs Memorial Park, on 26 November 1970 with Catholic rites by her married name, Matilda Mary Parsons. She was survived by her son Frederick Ralph (Devine) Twiss (1919–1978) and 2 grandchildren. Her funeral service was poorly attended and her death went virtually unnoticed by Sydney's media and population and it was said that very few people openly mourned her death. The only public eulogy offered to Devine was given by the then police commissioner Norman Allan who said: "She was a villain, but who am I to judge her?"