The man, who was fatally stabbed to death near a busy children’s playground in Southwark Park yesterday afternoon, has been named by police.
Detectives named the victim as Rocky Djelal, 38, of Bermondsey, and reissued appeals for witnesses to contact the police immediately.
A murder investigation was launched after police were called to Southwark Park shortly before 2pm yesterday.
Officers, the London Air Ambulance and London Ambulance Service attended, and found Mr Djelal suffering from stab injuries.
Despite their best efforts, they were not able to save Mr Djelal, who died at the scene.
Next-of-kin have been informed and a post-mortem is scheduled to take place this afternoon.
Police said that they believe Rocky may have been targeted in the broad daylight attack.
Detective Chief Inspector Simon Harding said: “This was a calculated and brazen attack, carried out in broad daylight in the middle of a busy park where children were playing.
“Any speculation about the motive is unhelpful at this early stage, but we do believe that Rocky may have been targeted.”
Witnesses have described the suspect as a white male believed to be aged between 20-35 years old and was wearing dark clothing with a hood covering his face.
He was also wearing a fluorescent hi-vis vest over the top of his clothing.
The suspect was seen on CCTV footage approaching Mr Djelal, stabbing him, before casually walking away.
DCI Harding added: “CCTV footage shows that the suspect was alone in the park shortly before the murder.
“He then left the park and re-entered via the Gomm Road entrance where he approached the victim and killed him.
“He then casually walked away after stabbing Rocky.
“There would have been numerous witnesses to both the attack and the events after the attack, including those who saw which direction the suspect went.
“I would appeal to anyone who has information that could assist this investigation to contact police immediately.”
There have been no arrests, while police enquiries continue.
Anyone with information is urged to call the incident room on 0208 721 4205 or Crimestoppers anonymously via 0800 555 111.
You can also tweet police via @MetCC