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Police have launched an appeal to trace a man in connection with the killing of Finbar Sullivan in Primrose Hill.
Detectives are offering a £20,000 reward for information leading them to 22-year-old Jordan Asije.
The force has also released an image of Mr Asije, who is known to frequent North London.
Finbar Sullivan, 21 , was a filmmaking student who died at the Primrose Hill viewpoint on April 7 after being allegedly kicked, punched, and fatally stabbed.
Despite best efforts from emergency services, Mr Sullivan died at the scene.
Since his death, three men have been charged with murder.
Ernest Boateng, 25, Alexis Bidace, 25, and Oliuwadamilola Ogunyankinnu, 27, appeared at the Old Bailey in June for a plea hearing before Judge Mark Dennis KC.
All three men entered not guilty pleas and have been remanded into custody.
A fourth man has been charged with grievous bodily harm.
Jordan Asije is not believed to pose a wider threat to the public, but should not be approached, the Met Police has said.
Detective Inspector Andy Griffin, who is leading the investigation, said: “My thoughts remain with Finbar’s family following their truly devastating loss. We have made significant progress in understanding the events that led to his tragic death and our enquiries continue.
“As part of this work, a reward of up to £20,000 is now being offered to encourage the public to help us arrest everyone we believe was involved in the murder. No piece of information is too small and what may appear insignificant to you, could prove vital to our enquiries.
“Jordan, if you are reading this, I urge you to do the right thing and hand yourself in at the nearest police station. I also want to make it clear that anyone knowingly assisting Jordan to evade arrest, or harbouring him, may be committing a criminal offence and can expect to be investigated and dealt with robustly.”
