@boomerang,
Apparently.
"The Associated Press reports that Delaware County District Attorney Jack Whelan is investigating the incident to determine if O'Neill's alleged attackers will be charged. Police said the injuries happened during a "one-on-one altercation, which was caught on tape."
Even if they didn't intend to kill the kid, intent to cause serious bodily harm to the victim which leads to death will likely fall within third degree murder in Pennsylvania, if these assaulters committed this at a older age.