A 12-year-old boy died Sunday after a January fight at his Philadelphia-suburb school left him hospitalized and under a medically-induced coma, ABC News said.
What happened before and after the fight, which left Bailey O'Neill with a concussion and a broken nose, is unclear to officials, the Delco Times said. However, Darby Township police and the county District Attorney's office have refrained from calling it a "bullying" case.
No charges have been filed, but the Delaware County District Attorney's Office has opened an investigation, ABC News said.
O'Neill had celebrated his 12 birthday on Saturday, ABC News said.