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.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? email@example.com