Surrey Police were called to Stoke Park just after 6pm yesterday.
The youngster, whose age hasn’t been revealed, was pronounced dead at the scene.
A cordon remains in place, with officers ‘urgently’ looking to speak to anyone with information.
Senior Investigating Officer Detective Superintendent Andy Jenkins said: “First and foremost, our thoughts are with the family and friends of the victim at this desperately sad time.
“I know there will be a lot of concern and speculation in the local community following the events of last night. I would like to reassure them that our officers are working around the clock to establish the circumstances of this tragic incident, gather as much evidence as possible, and identify and bring those responsible to justice.
“Our investigation is still in its early stages, and we are urgently looking to speak to anyone with any information that may assist our enquiries.
“Were you in the area around Lido Road, Parkway, and Stoke Park between 6pm and 6.20pm on Monday, 19 January? Did you see anyone acting suspiciously in the area or running from the woods around this time? Any piece of information you have, no matter how small, could be significant.”
