Detectives have put up a £20,000 reward in a bid to solve the murder of a young man stabbed to death in the stomach in 2018.
Yaya Mbye Sankareh, 26, collapsed in a children's play area after being chased through a housing estate in Stoke Newington, north east London.
Three years on, grieving family and friends are still waiting for his killer to face justice.
Witnesses told the Evening Standard how Yaya was set upon by a gang of three or four men at around 11.30pm on January 28.
Police said he was repeatedly stabbed in the 'pre-planned' attack and his attackers fled in a silver Mercedes estate car which was later found destroyed.
Passers-by gave first aid to Yaya in a desperate bid to save him before he was rushed to hospital but he was pronounced dead an hour later.
A post-mortem examination revealed he died from a stab wound to the stomach.
Murder detectives launched an investigation led by the Met's Specialist Crime Command but despite efforts, the case remains a mystery.
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DCI Perry Benton, said: "We have not given up on our fight for justice and I believe this new reward offers an opportunity for those who haven't come forward before to contact police.
"Yaya's death has understandably had a huge impact on his family and friends and we remain committed to bringing them the closure they need and deserve."
Speaking shortly after the tragedy, detectives said they believed there was "a level of planning" behind the attack.
DCI Benton said: "Three years have now passed since this tragic incident and I know that over time allegiances change and people who may have been afraid to speak to us before could now be willing to share information.
"We have been met by a wall of silence from the community but I want to reassure you that anything shared with officers would be treated sensitively.
"I am asking people who were in the area in January 2018 to think back to that night and to try to remember if they saw or heard anything suspicious.
"Was a friend or relative acting suspiciously in the days after Yaya's death? No piece of information is too small."