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Police, London Ambulance Service (LAS) and London's Air Ambulance attended and paramedics tried to resuscitate him but he died after being airlifted to a hospital.
"He was 18, never hit rock bottom Adidas Originals White Gold
He had been staying with his elderly grandmother in Hackney.
The oldest friend of Adidas Neo Lite Racer Maroon Sneakers
"He went to secondary school and saw the divide of these people and got in with the wrong crowd.
"His smile used to touch ear to ear, he had a unique look about him."
"I would also like to appeal directly to those that have knowledge of this murder to contact police."
Mr Retschulte added: "People manipulated him and there was peer pressure, people saying things like 'oh you're not going to stab him' and stuff.
"Our thoughts are with his family and friends at this difficult time."
He said: "No one is helping the police, I am scared someone else will get killed today, I told them what I know.
Best friend scared of more stabbings as he pays tribute to murdered teen From Richmond and Twickenham Adidas Tubular Primeknit Core Black
John Retschulte, 21, from Twickenham, went to school with Jamil Palmer, of Belgrade Road, who was stabbed to death in broad daylight on Tuesday afternoon.
and never went to prison so never had the chance to turn it around."
Helen Lockey, headteacher at Hampton Junior School, described former pupil Mr Palmer's death as a "tragedy".
An 18 year old man and a 16 year old boy were arrested on suspicion of murder last night and are in custody.
"He was a good boy who went down the wrong road."
He said: "With the road he chose, we were expecting it it is terrible but not a shock.
"I want people to know what Jamil was like and the choice he made I have lost a few friends to murder and to prison.
Mr Palmer went to Hampton Junior School, Teddington School and Richmond College, where he studied politics until 2013, as well as a stint at Kingston College.
She said: "While at Hampton Junior School, Jamil was happy and very well liked boy who was popular with both staff and children alike.
Detective Chief Inspector McHugh said: "I would like to urge anyone who was near Evans Grove, Feltham, between 3pm 3.30pm on Tuesday, May 6, to get in touch with police.
an 18 year old from Hampton, who was stabbed to death near Crane Park yesterday, has paid tribute to the former Richmond College student.
The incident happened in Evans Grove, Feltham at about 3.30pm and Mr Retschulte spoke of his sadness but lack of shock over his best friend's death.
"They may well have seen something which Adidas Los Angeles Granite could be of vital importance.
Mr Retschulte said Mr Palmer's mother was on holiday and unable to be contacted regarding her son's death.
"I have known him since I was 10 and it is such a sad thing but for the last 18 months he was not the same and became obsessed with knives and knife crime.
"He was very funny, the one thing I would say is he shot up like a sunflower almost overnight from being a chubby little boy to 6ft 4in.
A murder investigation has been launched by detectives from the Homicide and Major Crime Command in Putney under Detective Chief Inspector Noel McHugh.
He said that Mr Palmer was mocked by his friends for being smart and that people took advantage of his good heart.
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