Hunter Hillenmeyer was placed on a season ending Injured Reserve. According to the Chicago Tribune Hillenmyer believes that he is suffering from the continual effects of a concussion sustained in the preseason.
However there is a unique quality to this particular case, and that is the fact the Hillenmyer is one of the NFL players that have made the decision to donate their brain for NFL research. This of course will happen after he has a long and wonderful life. The NFL and others are interested in the long-term effect of multiple concussions and how they may relate to Traumatic encephalopathy.
Hillenmyer is also one of the most active advocates for player safety, where his personal focus has been concussions.
The Concussion Blog 