The 34-year-old, who police have named as Sean Williams was killed on Thornsbeach Road, Lewisham.
Detective Chief Inspector Kate Kieran, who said: “At this early stage we believe that both the victim and the suspect had attended an unlicensed music event at Culvery Road, SE6, during which, a fight broke out between two men.
“The victim intervened in this fight and suffered a fatal injury.
“I know there were around 100 people at the event and someone who was there knows the identity of the person responsible.
“I want these people to do the right thing and get in touch.
“I also urge the person responsible to hand themselves into police.”
A murder investigation has now been launched into the attack.
More to follow…
Source:Daily Express :: UK Feed