That severed his spine, did it?
As others have pointed out the whole spine injury thing is without public documentation at this time. Alleged to be 80%, not complete, he didn’t look too good going into the Paddy(is that racis’?) Wagon. A crushed trachea at the end of the trip is problematic though.
Ingesting heroin might have been the reason he was bouncing off the walls of the van, fell and broke his own neck. Let's see the prosecution prove otherwise.
After being seen in a hand to hand transaction, Gray did not have the drugs on him when he was search. Gray is not known for heroin use, yet it showed up in his urine test. Ingestion of heroin in a substantial dose causes breathing difficulty, convulsions, heart failure, and coma. Is it just a coincidence that Gray had all of these symptoms? Could the thrashing around reported by the other passenger have been heroin induced convulsions that also resulted in Gray’s injury which the medical examiner said was consistent with a bolt in the back of the van?