A £20,000 reward is on offer for information that could help police lock up a killer.
Imran Maroof was just 20 years old when he was stabbed to death in Newham's Plashet Park on July 27 last year. Despite a quick police response, his killer got away.
Police had first been called to reports of a fight, and when they got there found Imran. The best efforts of paramedics weren't enough to save him, however, and he died at the scene.
"The murder has had a profound impact," DCI Samantha Townsend said, "Imran's family and friends continue to live with the trauma.

"One year has passed since this senseless killing, and the Met remains committed to bringing those who killed Imran to justice. If you were in the vicinity of Plashet Park on the day of the stabbing or know anything that could help us, we need you to contact us."
Alexa Loukas, London Regional Manager for charity Crimestoppers, which is offering the reward, said: "We know that some people may be reluctant or worried to speak directly to the police with information, which is why Crimestoppers is here. We are completely independent and guarantee you will remain 100% anonymous when you contact us.
"We offer a safe way for anyone to come forward and tell us what they know but not who they are. We are unable to identify any phone numbers or IP addresses if you are reporting online.
"Imran’s family deserve answers, and we hope this reward will encourage someone to do the right thing and speak up with any information that may help the police."
Anyone with information is asked to call 101, quoting crime reference 6541/27JUL.
Alternatively, to remain anonymous, please contact Crimestoppers on 0800 555 111.
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