What makes you think he killed himself? Did maybe another adult nearby kill him with a gun he or she had, and would the media report that properly? Is the media honest because it would make the adult who shot him a hero?
I am not saying he did not kill himself because I truly don’t know but I wonder if we would have heard it if someone else had pulled the trigger on him.
There is a SWAT practice of letting these guys bleed out before declaring them dead by suicide. Since they control the forensics end they make sure the paperwork matches the report.