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The final image is of Graham Snell, who was murdered and dismembered by his lodger in Chesterfield in 2019.
The IOPC said chances were missed when Mr Snell told police he feared his uninvited lodger may harm him.
Dept Chief Constable Kate Meynell said the screensaver initiative was part of a week-long exercise “identifying and addressing vulnerability”.
“Identifying and addressing vulnerability in policing has become increasingly complex and sometimes unpredictable,” she said.
“However, as an organisation it is crucial that we identify and share learning that arises from our investigations and engagement with the public to ensure our officers and staff are equipped to respond to the increasingly complex and dynamic nature of policing.”
“The objective of the week was to increase awareness and share learning to ensure that we continually improve our services to the public and make sure our staff and officers have access to the latest information and good practice.”
Ms Swann has previously been the victim of social media abuse after leading the police evacuation of villagers after a reservoir dam wall was breached. She said “sexist and homophobic” abuse sparked by her hairstyle led her to leave social media.