I am not an attorney but this seems to be premeditated, so I believe they should be charged with murder.
They were looking for trouble and found it. I hope they all spend many years behind bars to contemplate their actions.
My deepest condolences to this young man's family, friends and girlfriend. So sad that he leaves a 6year old boy behind. Just a senseless tragedy.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).