Detectives investigating the murder of an Afghan man are seeking three men they need to interview.
Enayit Khaili, 26, died after being stabbed when he answered the door at Fiennes Road in Rose Hill, Oxford, in March.
Six men arrested on suspicion of murder have all been cleared.
The three wanted men are known associates of Mr Khalili but have not been identified.
Officers are expected to release their identity to the public on Tuesday.
Police are offering a £5,000 reward for any information which could lead to the conviction of Mr Khalili's murderer.
Anyone with information should call police on 08458 505505 or Crimestoppers on 0800 555111.
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