I remember reading a short outline of this story in a True Crime Anthology and was amazed, and very saddened.
From the Blurb:
This is the true crime account of Eugenia Falleni, a woman who in 1920 was charged with the murder of her wife. Eugenia had lived in Australia for twenty-two years as a man and during that time officially married twice. She lived a full married life with her first wife, Annie, for four years before Annie realised that her husband was a woman. Even after Annie knew, they lived together for eight months before they went on a bush picnic, when Annie mysteriously died. Her body was not identified for almost three years, and during this time Eugenia married again, this time to Lizzie. When Eugenia was finally arrested and charged with Annie’s murder, the police attempted to tell Lizzie that her husband was a woman. She laughed at them—she was so convinced that her husband was a man that she thought she was pregnant to him.