This guy started a fight, with one punch he was knocked out, then died.

Despite the medical examiner's determination that the September 25 death of Dakota Escritt, 17, in Council Bluffs was a homicide, the Pottawattamie County attorney announced on Wednesday that Gregary Teer, 16, had used what was described as reasonable force to defend himself under Iowa law. Wearing a black hoodie, Escritt can be seen in the footage repeatedly shoving a Teer, before his schoolmate responds in kind. Both boys next raise their arms before Teer delivers a blow that knocks Escritt to the ground and leaves him lying unconscious. Escritt was rushed to a nearby hospital, but succumbed to his injuries three days later. An autopsy revealed that the cause of death was blunt force trauma caused when Escritt's head bounced off a floor tile. The dispute between the two teens apparently began the week before the incident when Teer exchanged words with a friend of Escritt's after colliding into him during a gym class. That same night, Escritt and Teer reportedly exchanged profanity-laced Facebook messages. The virtual exchange was the last known incident ahead of the confrontation that eventually took Escritt's life.