Yeah. This is pretty much my thinking. Murder is killing someone with intent. Manslaughter is the unintentional killing of someone by your actions without predetermination or forethought.
Charging a 14 year old with murder in this case seems a bit extreme. He should be punished for sure, and it's horrible someone died, but it was due to poor choice and the obvious lack of thought of a child.
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Oh, I am not saying he wasn't stupid, didn't do something wrong, or saying he shouldn't be tried or punished. I am saying this wasn't murder, as such, and his age needs to be taken into account when determining the punishment.