James Markham confronted a group of teenagers who were causing a disturbance (Credit: Metropolitan Police)
James Markham, 45, was stabbed after confronting a group of youths in Churchill Terrace at around 6.20pm on Monday, 9 August.
Despite the efforts of emergency services and members of the public, he was pronounced dead at the scene.
A post-mortem examination later found he died from a stab wound to the lung.
Police detained a 14-year-old boy on suspicion of his murder yesterday.
A second 14-year-old boy was also arrested on suspicion of conspiracy to murder. They both remain in police custody.
“We believe that James confronted a group of youths causing a disturbance and was stabbed as a result,” said Detective Inspector John Marriott.
“The brutality of this response is beyond shocking and our thoughts are with James’ family who have been left devastated by their loss.
“The arrests of these two individuals is a significant development but we still need the public’s help to build a full picture of exactly what happened on Monday evening.
“I know that there were a number of people present at the time of the murder. I want them to come forward.
“I also believe there will be parents who know that their child was there, or was involved. I am appealing for them to do the sensible thing and get in touch with us.
“A dedicated team of officers is working to piece together the tragic circumstances that led to this murder and to bring those responsible to justice.”
Anyone who witnessed the incident, or has information about what took place, is urged to call police on 101 or tweet @MetCC, giving the reference 5735/09AUG.
Information can also be provided to Crimestoppers, anonymously, by calling 0800 555 111.
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