Hassan Mahmood died in hospital after suffering a single stab wound to the back following the incident on Monday night, West Midlands Police said.
The 15-year-old was attacked in Oaklands Park in South Yardley, Birmingham, shortly before 6pm.
West Midlands Police have charged a 16-year-old boy, who cannot be named for legal reasons, with Hassan's murder.
A second 16-year-old boy has been charged with assisting an offender in connection with the incident.
They will both appear at Birmingham Youth Court on Friday.
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