48 year old Frederic Pallade, died following an incident in Clydach three months ago.
It happened on Gellionnen Road at approximately 8.30pm on Wednesday 17 April 2019.
Mr Pallade was found severely injured in the street before being taken to Morriston Hospital by ambulance where he passed away later that evening.
A man has been charged in connection with his death.
South Wales Police Major Crime Investigation Team are trying to trace three potential witnesses who were in the area at the time of the incident and who may be able to provide eyewitness which may assist the investigation:
They are all believed to be white men.
The first is aged about 50, of thin/skinny build. He indicated to other people at the scene that he knew Mr Pallade.
The second is described as wearing shorts and baseball cap
The third is described as being in his 40’s and wearing a grey coloured hooded top and tracksuit and was speaking into a mobile phone at the time
Anyone of these people or anyone with information should contact 101 or Crimestoppers on 0800 555 111 quoting occurrence 1900137590