Being Obese and out of shape exacerbates chronic asthma like Garner had. It was the asthma that killed him, but the POS cop used an illegal choke hold on the man in order to subdue him because Garner was resisting arrest. Its obvious Garner was resisting, he tried to slap officers hands out of the way. When will people learn that you CANNOT talk your way out of an arrest, trying to do is futile and only brings more trouble and possibly more charges. Even if you VERBALLY resist arrest, its still resisting.
Of course the Cop can't be found guilty, when will people learn that? If you start finding cops guilty of crimes for carrying out their duties, then most cops would resign and we would have a whole lotta trouble in the streets.