Police have launched a murder investigation after a man was stabbed to death after a fight following an illegal rave.
Sean Williams died after being knifed in Lewisham, south east London, in the early hours of Sunday morning.
The 34-year-old was found with stab wounds to the neck.
An ambulance was called to Thornsbeach Road, Lewisham, just after 2am but paramedics couldn't save him.
He was pronounced dead at 6am, the service say.
Although a formal identification hasn't taken place yet, police have named the man.
They believe he had attended an illegal rave when a fight broke out and quickly got out of hand.
A second unnamed man, 37, also suffered a non-life threatening stab wound to the hand.
Detective Chief Inspector Kate Kieran 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."