Murder detectives have arrested two men over the fatal stabbing of 21-year-old Finbar Sullivan in Primrose Hill.
The men were detained on Friday, April 10, following the tragic incident at the popular London viewpoint on Tuesday.
A 25-year-old man has been arrested on suspicion of murder, while a 27-year-old man has been arrested on suspicion of assisting an offender, the Met Police said on Saturday.
They remain in police custody at this time.
Finbar, the grandson of legendary cinematographer Michael Seresin, was stabbed to death after a fight broke out at Primrose Hill on Tuesday afternoon.
Police were called to the scene at 6.41pm, just two hours after Finbar had left his home in Maida Vale with his brand new camera equipment, telling his father, artist and musician Chris Sullivan, he would be home for dinner.
The London Screen Academy student, who sought to follow in his family's footsteps in the world of film and already produced drill rap videos, suffered multiple stab wounds.
Paramedics and members of the public attempted to save his life but he sadly died at the scene.
Finbar Sullivan, 21, studied at the London Screen Academy and produced music videos for drill rap artists under the name Sully Shot It
Finbar Sullivan, centre, with his mother Leah Seresin and father Chris Sullivan. Film student Finbar was fatally stabbed on Tuesday
A second man in his 20s, believed to be a friend of Finbar's, also suffered stab wounds and was found nearby by police.
He was rushed to hospital where it was confirmed that his injuries were not life-threatening.
At the time of the violence, the park was packed with families and friends enjoying the unseasonably warm weather following the Easter weekend.
Police are asking for witnesses, or those with footage or information about the incident, to get in touch quoting reference 6448/07Apr.
Speaking to the Daily Mail, Finbar's father said: 'He was just a little groovy 21-year-old who loved movies and making films. He didn't drink, he didn't smoke, he didn't go out.
'He'd stay at home editing his films six nights a week. He wanted to follow in his (grandfather's footsteps) and be a cameraman.
'He recently did a video for Joseph Corre, Vivienne Westwood's son.
'We were just about to start a company together… he was going to do his showreel today with me. And now he's dead.'
Detective Inspector Andy Griffin, who is leading the investigation, said: 'My thoughts remain with Finbar's family who continue to receive support from specialist officers at this unimaginably difficult time.
'Although we have made two arrests, my officers continue to work around the clock to trace everyone involved. I'd like to thank the public who have come forward with information so far.
'If you are yet to speak to us, or share footage from Tuesday relating to this incident, please do not hesitate to get in touch. Anything you submit could have a huge impact on our investigation.
'In the meantime, residents can expect to see an increased police presence as dedicated local officers continue patrols in Primrose Hill and the surrounding areas.'