Ten years after the murder of 19-year-old Edvin Johnson in Southwark, southeast London, Metropolitan Police detectives have launched a fresh appeal for information to catch his killer, or killers - offering a reward of £20,000 for information leading to the identification, arrest and prosecution of the person or persons responsible.
One of the knives found at the murder scene
One of the knives found at the murder scene
Edvin was found with a single stab wound to his groin at around 9pm, on Sunday, 16 September 2007 in the stairwell of Barnet House on the Crawford Estate in Camberwell. London Ambulance Service attended and he was taken to Kings College Hospital where he was later pronounced dead.
Edvin Johnson
Edvin Johnson
He had been about to start a course in Business Studies at Southampton University.
Investigations revealed that a group of approximately 12 youths were on the estate at the time of the incident and it is believed that five of these youths attacked Edvin and another man, neither of whom are believed to have been the intended target.
Knives were recovered during subsequent police searches of the area. Two silver handled knives, found together, appeared to be from the same set and one of these knives had Edvin's blood on it.
A knive found at the murder scene
A knive found at the murder scene
Detective Inspector Justin Howick of the Met's Homicide and Serious Crime Command, said: "Ten years have passed since Edvin's murder and despite an extensive police investigation and several arrests, to date we have not been able to bring the perpetrator to justice. I am convinced that there were people on the Crawford Estate on the night of the murder who saw what happened but didn't feel able to speak with police at the time.
"Today I would like to renew the appeal for those witnesses to speak to me in confidence, in the hope that they will now feel able to tell me what they saw, so that I can bring Edvin's murderer to justice and bring some sense of closure to Edvin's family.
"I would also urge anyone with information, particularly anyone who remembers two silver handled kitchen knives from the same set going missing in September 2007 to contact the incident room on 020 7230 4424, or Crimestoppers anonymously on 0800 555 111."
Edvin Johnson mother's appeal
Edvin's mother Genevive Johnson, said: "Edvin was a wonderful young man. He was looking forward to starting his life in the University of Southampton. On that day the call came through and a voice on the other end said "Aunty, come quickly". I rushed to the next building in the compound where we lived. I climbed up the stairs to find my son lying in a pool of blood. We are asking someone, please, to search their conscience; to listen to that still, small voice inside and to come forward and speak out, to help us make that closure."