Images released as police investigate Derby murder
A man was taken to hospital where he later died
Officers are appealing for four people to contact them as they may have important information as part of an investigation into a murder.
Police were called to a report of an attack in Green Lane, Derby, just after 12.30pm on Monday 3 July.
The victim, a man in his 50s, was taken to hospital in a critical condition but died nearly two weeks later.
Derbyshire Police say four people are shown who they would like to talk to as they may have witnessed what happened in Green Lane and be able to help as part of the investigation.
A man, in his 50s, has been arrested on suspicion of murder and has been bailed pending further enquiries.