Australian police are yet to pinpoint a motive for the killing of a New Zealand-born nurse at her Sydney home.
Michelle Beets, a nurse manager in the emergency department at Sydney's Royal North Shore Hospital, was found stabbed to death on Tuesday evening, shortly after she arrived home from work.
Two people walking their dogs saw a man running from her Chatswood house. Neighbours reported hearing screams on the quiet street around the time she was killed.
Police have described Ms Beets' injuries as "callous" and say they do not know if she knew her killer, the ABC reports.
An ABC correspondent says police are not sure whether she was targetted or whether she interupted an intruder.
Ms Beets, 57, had worked at Sydney's Royal North Shore Hospital for almost 25 years. Colleagues there say she was a mentor, and say they have been left shocked and devastated by her death.
She studied at Epsom Girls Grammar School in Auckland and worked at Green Lane Hospital before moving to Britain and eventually to Australia.