In a raw, heart-wrenching video that has exploded across social media, the mother of murdered 21-year-old film student Finbar Sullivan has collapsed in tears, desperately begging a mystery young woman who filmed the savage attack on her son to come forward and hand over the footage that could finally reveal the full truth behind his shocking death.

“She got the evidence… please, just say something.”

Those broken words, delivered through sobs by Finbar’s devastated mother, have gone viral, striking a chord with millions who are demanding answers in one of the most disturbing killings to hit London in recent memory. The footage — captured on a mobile phone by a young woman or teenager standing nearby — is believed to show the terrifying moments leading up to the fatal stabbing on the slopes of Primrose Hill, one of the capital’s most picturesque and supposedly safe beauty spots.

It was a bright, sunny Tuesday evening, April 7, 2026, shortly after 6:30 p.m. Finbar Sullivan, a talented aspiring filmmaker known affectionately as “Sully Shot It,” had left his family home in nearby Maida Vale with his brand-new camera slung around his neck. The camera was a special 21st birthday gift from his loved ones — a tool to fuel his passion for shooting music videos and chasing his dreams in the film industry. He told his father Christopher, a musician, “Love you, Padge, see you later — I’ll be back to cook dinner.” It was the last ordinary conversation they would ever share.

Finbar headed to Primrose Hill with a friend, excited to test the new equipment and capture some footage of the stunning London skyline at golden hour. What should have been a peaceful, creative outing turned into a nightmare in seconds. According to prosecutors, he was suddenly surrounded by a group of men in what erupted into “an explosion of extreme violence.”

He was punched, pushed violently to the ground, then kicked and stamped on repeatedly by up to seven attackers while helpless on the grass. Witnesses described screams echoing across the hill as the brutal assault continued. Finbar was then stabbed multiple times and left bleeding out in the open. A second young man in his 20s was also stabbed nearby and rushed to hospital with non-life-threatening injuries.

Emergency services arrived quickly, but Finbar could not be saved. He died at the scene — a gentle, creative soul extinguished in one of the most public places in north London.

Now, days later, the focus has shifted to a crucial missing piece: the mystery footage. Police have released images of a young woman or teenager seen recording the fight on her phone just before the fatal stabbing. She was wearing a pink vest, blue denim shorts, and black trainers. Detectives say her video is “vital evidence” that could piece together the exact sequence of events, identify those involved, and show precisely how the violence escalated to murder.

Despite repeated public appeals from the Metropolitan Police — and now this emotional, tear-streaked plea from Finbar’s own mother — the woman has not come forward. Some reports even suggest her details have mysteriously vanished from police records, fueling wild online speculation and conspiracy theories that have only intensified the viral storm.

In her heartbreaking video message, Finbar’s mother breaks down completely, her voice cracking with raw pain as she urges the mystery witness: “She got the evidence… please say something.” She pleads not just for justice, but for the chance to know exactly what happened to her son in his final terrifying moments — the moments when, according to earlier reports, Finbar begged for his life.

The family’s agony is compounded by the ordinary innocence of the day. Finbar was not involved in gangs, did not drink or take drugs, and had recently overcome an eye impairment that had briefly slowed his filmmaking ambitions. He was simply a kind, outgoing young man who loved movies, music videos, and capturing life through his lens. Friends and family describe him as humble, talented, and full of light — the kind of person who made others smile.

His father Christopher Sullivan has spoken movingly of his only son, calling him “exceptional” and vowing to spend the rest of his life honoring Finbar’s memory. In interviews, he expressed disbelief that such violence could erupt on Primrose Hill — a place as familiar and safe as Hyde Park. The family has urged the public not to twist the tragedy for racial or political agendas, instead calling for accountability and an end to the knife crime plaguing London’s streets.

So far, three men have been charged in connection with the murder. Oluwadamilola Ogunyankinnu, 27, of Enfield, appeared at the Old Bailey charged with murder and dramatically declared in court, “I didn’t kill anybody. I didn’t stab anybody. They’ve got the wrong person.” Two other men, Alexis Bidace, 25, and Ernest Boateng, 25, have also been charged with murder and remanded in custody. A fourth teenager, 18-year-old Khalid Abdulqadir, faces charges including grievous bodily harm with intent, violent disorder, and possession of a knife. A provisional trial date has been set for next year.

Yet without the mystery woman’s footage, many fear critical details could remain hidden. Police have stressed that she has committed no offence and is being treated solely as a significant witness whose account could prove decisive. Detectives leading the investigation have repeatedly appealed for her, or anyone who knows her, to contact them immediately.

The case has ignited fierce debate and an outpouring of grief online. Tributes to “Sully Shot It” flood Instagram and TikTok, with fellow creatives sharing his work and remembering his passion. On X and Facebook, the mother’s viral plea has been shared hundreds of thousands of times, sparking calls for the witness to “do the right thing.” Some posts rage against London’s knife crime epidemic, while others focus purely on the human tragedy of a bright young life cut short for no apparent reason.

Primrose Hill, once a symbol of beauty and leisure, now stands cordoned off in memory, its grassy slopes stained by a crime that feels all the more shocking because of its location. The camera Finbar carried that day — meant to document dreams — instead became part of a crime scene that may never be fully understood without that one missing video.

Finbar’s mother’s broken plea cuts through the noise: a mother’s love demanding truth in the face of unimaginable loss. “She got the evidence… please say something.” Those words have become a rallying cry, a final desperate call from a family shattered beyond repair.

As the investigation presses on and the charged men await their day in court, the eyes of London — and the nation — remain fixed on one young woman whose phone holds potentially explosive evidence. Will she finally step forward? Will the footage she captured bring some measure of justice and closure to Finbar Sullivan’s grieving family?

For now, the slopes of Primrose Hill remain quiet, but the echoes of screams, the desperate pleas for life, and a mother’s tearful appeal continue to reverberate loudly across the internet and beyond. Finbar Sullivan went to the park on a sunny evening to chase his creative dreams. He never came home. The truth about exactly how and why he was taken may still lie in the hands of someone too afraid — or unwilling — to speak.

The family waits. The public watches. And one mother’s heartbroken voice rings out: “Please… just come forward.”

Justice for Finbar demands nothing less.