“second suspect”
That could have just been an erroneous report that made its way into the story early. Often those errors are simply dropped from the story line with no explanation.
Or, it could be that the kid was a well intentioned CC holder shooting at the real murderer (2nd suspect) who was actually an FBI agent. The cops see the kid first and take him out. Laughing at his good fortune, the FBI guy makes his escape.
As often as we hear about a second suspect in these things, those really are the only two possibilities.
Our domestic enemies have been losing lately, and with their ultra-important Hatefest I tonight, really needed this.