I don’t think the chokehold killed Mr. Garner, but I believe that the autopsy will show that his prone position on the sidewalk resulted in either his heart being unable to beat or he had a lung collapse and died that way...
Agreed, positional asphyxia.
Bottom line: that chokehold is banned, idiot boy with a badge used it anyway.
But for his actions, the dude would not have died.