In 1912, she was convicted of manslaughter. for the death of Claire Williamson, a wealthy British woman, who weighed less than 50 pounds at the time of her death. At the trial, it was proven that Hazzard had forged Williamson's will and stolen most of her valuables. Williamson's sister, Dorothea, also took the treatment, and, it is alleged, only survived because a family friend showed up in time to remove her from the compound. It is suggested that one of them managed to smuggle a telegram to alert the family; however, by the time of arrival, Claire had already died. Dorothea was too weak to leave on her own, weighing less than 60 pounds. She later testified against Hazzard at trial.