On the one year anniversary of 28-year-old Teon Palmer's murder, police are returning to the scene of the crime in Edmonton to appeal for information.
Officers are offering a reward of up to £20,000 for details that lead to the prosecution of his killer or killers.
Teon's family and friends will also be returning to the Goodwin Road area to pay tribute to him by holding a vigil.
Teon died of a single stab wound to the chest.
DCI Neale Baldock is leading the investigation.
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.