A £20,000 reward is being offered for information on the whereabouts of a man following a fatal stabbing on London’s Primrose Hill.
Finbar Sullivan, 21, was killed during a fight at the lookout on April 7.
His father previously said that the filmmaking student had gone to the park to try out a new camera that he had received for his birthday.
Another man in his 20s also suffered injuries in the fight, but they were not life-threatening.
The Metropolitan Police are now offering a £20,000 reward for Jordan Asije, 22, saying that they “urgently wish to trace” him.
Detectives also appealed directly to Mr Asije on Tuesday morning, telling him to “do the right thing” and hand himself in.
Mr Asije, who is known to frequent north London, is not believed to pose a threat to the public.
However, he should not be approached, the force said.
Detective Inspector Andy Griffin, who is leading the investigation, said: “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.”
Anyone who sees Mr Asije should call police on 999, or call 101 quoting reference CAD 6448/07APR26.
Mr Griffin added: “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.”
Three men – 27-year-old Oliuwadamilola Ogunyankinnu, 25-year-old Alexis Bidace, and Ernest Boateng, also 25 – have already been charged with Mr Sullivan’s murder. They have pleaded not guilty.
A fourth man, 18-year-old Khalid Abdulqadir, has been charged with grievous bodily harm.
Ogunyankinnu, Bidace and Boateng, all from Enfield, and Abdulqadir, from Camden, have all been remanded into custody.
