Why did Jr Seau shoot himself in the chest? Why not the head? Because he wants his brain examined with the autopsy. His Seratonin levels will be off the chart. A few Hockey players haved committed suicide the same way. Their Seratonin levels were elevated so high due to concussions, it was comparable to that of a mass murderer. His autopsy will shed more light on this condition.
Head? Chest? Does it really matter? He got the job done. Which is the entire point of shooting yourself, isn't it?