Detectives have released a photo of four men they wish to speak with in relation to a man who died in Croydon last summer.
Simon Whisker, 40, died two weeks after he was attacked by four men who left him lying in the street in south London.
He had been sat drinking with a friend on London Road when he was punched and stamped on about 1.30am on Wednesday July 1, 2020.
London Ambulance Service attended the incident and Mr Whisker was rushed to hospital.
After receiving treatment he was discharged, but returned to hospital on July 13 where he died.
A post mortem examination was conducted but did not establish a cause of death.
Almost 18 months after Mr Whisker’s death, his family continue to a struggle to come to terms with their loss.
His father Derek Whisker said: “My family are devastated by Simon’s death and we are finding it very hard to deal with the situation.
“My wife is very unwell in a care home. I am Simon’s father and I am trying to stay strong for my family’s wellbeing.
“I’m finding things very hard to deal with. If you recognise the suspects on CCTV please speak to the police.”
Police said they are awaiting the pathologist’s report and despite previous appeals, the suspects have never been identified.
DC Jo Cheung, investigating from the South Area Command Unit, said: “Being the victim of a violent crime is devastating and there is no way to determine how a person will react in that situation.
“Simon’s reaction was a need to draw a line under it and put it behind him.
“Whether he would have lived if he had continued medical treatment we will never know, but we do know that those who launched the vicious attack on him must be brought to account for their part in the last weeks of his life.
“Today I am re-issuing the images of four men that I would like to identify in connection with this case and hope that someone who may not have felt they could come forward last year, may now feel able to give us the information that we need.
“If you know the identity of any of the men shown please do the right thing, not just for Simon, but for his grieving family and to make your own streets safer.”