Reece Young, 23, was fatally stabbed last night in Croydon, while two other men were wounded.
Friends of Tai Jordan O’Donnell, 19, who died the same street on March 3, had gathered for a small vigil when the attack took place.
A fight between three men broke out in Alpha Road at around 9.10pm and Mr Young died at the scene.
Locals saw police officers running over with first aid kits and a defibrillator, but they were unable to save him.
Two men left the scene in a vehicle before officers arrived, and later showed up at a south London hospital with stab wounds believed to have been sustained in the same incident.
Metropolitan Police officers went to the hospital and arrested both men on suspicion of murder.
The first suspect, aged 33, remains in hospital where he is being treated for non-life threatening injuries.
After his arrest, the second man, believed to be in his 30s, assaulted police officers and NHS staff before forcing his way out of the hospital, according to police.
Now the Met are calling on members of the public to help them track him down.
Detective Chief Inspector Richard Vandenbergh said: ‘We believe this incident was witnessed by a number of people.
‘They had gathered for a small vigil in remembrance of another recent fatal stabbing victim when an altercation began.
‘Some of those people have already spoken to police, but I believe there are others who captured images and video of what happened. I need those people to contact us immediately.
‘The information they have could prove vital in establishing the chain of events that has led to a young man losing his life.
‘One arrest has been made and my team are working with colleagues across the Met to establish the whereabouts of the second man.
‘We believe he suffered injuries that require urgent medical attention. He is urged to make contact with us immediately.’
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