The stress of the fight he started triggered a fatal heart attack. His death was entirely his own fault.
Entirely? At some point he was restrained, but struggling because he couldn’t breathe. The police should have recognized that.
Yes, he kept *saying* he couldn’t breathe. He kept speaking. He died while being fully able to breathe on the ambulance, because he had a heart attack from the exertion and stress.
That is one version. The medical examiner and the Civilian Complaint Review Board came to a different conclusion.