Officers were called to the stabbing in Highbury Fields, Islington shortly before 9pm on Thursday, and found the boy with stab wounds.
He was treated by medics before being taken to hospital where he sadly died a short time later.
His next of kin were informed. They continue to be supported by specialist officers.
A post-mortem examination found the cause of death to have been a stab wound, shock and haemorrhage.
Det Insp Ben Dalloway of the Met’s specialist crime command said: “The investigation team are fully focused on securing justice for Deshaun and his family.
“We are working around the clock and are very keen to hear from anyone who was in the area of Highbury Fields between 8pm and 9pm on Thursday, August 4.
“Did you see anyone running or behaving suspiciously? Can you help us build a picture of the events that led to Deshaun being stabbed?
“You will continue to see police in the area for the foreseeable future, please approach them with any information you may have.”
Borough Commander for Camden and Islington, Ch Supt Andy Carter said: “This is an incredibly tragic case where a young man`s life has been ended prematurely despite the efforts of the police officers and LAS who arrived on scene very quickly.
“Deshaun had his whole life in front of him and that has now been cruelly taken away and our thoughts are with his family and friends who will be devastated by this loss.”
He added: “We know that there were lots of people in the park on Thursday evening, many of whom were young people who may be finding it difficult to come forward.
“I would urge you to think about Deshaun`s family who are looking for answers.
“You may hold vital information that enables us to provide those answers; please don’t keep it to yourself.
“We will support you if you come forward to speak to us in confidence.”
Officers will be conducting a witness appeal in the park on Thursday, he added.
Anyone with information can contact police direct on 0208 345 3865, call 101 or Tweet @MetCC quoting 7948/4AUG.