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Is actually headed for the boston university school of medicine. where evidence of brown tangles, damage in the brain called chronic traumatic ensef lop they've, or cte, have thus far been found in 30 ex-athletes. many of whom like duerson, played professional football. in the next several months, duerson's brain activity will be studied. perhaps this will provide answers for fellow athletes still living. >> we hope it really makes a difference and once they find out what the cause is, that the nfl takes a stand and says, okay, we are going to try to alleviate this problem, because if you don'...

Himself in the chest. the details are hazy, but friends and family say the manner in which duerson shot himself may have been to protect the one thing he could leave behind, the one thing that might help fellow athletes. echoing his final text message, duerson left behind a haunting missive. "please see that my brain is given to the nfl's brain bank." >> he's always been a strong person on and off the field, and even at the end, you know, he's trying to help somebody. >> reporter: tissue from duerson's brain is actually headed for the boston university school of medicine, where evidence of bro...

And the microscopic vision. in the middle is a football player 45 years old. look at the difference there. the brown tangles that is the same sort of thing you see in people who has alzheimer's disease. on the far right is a 70-year-old person who is a boxer who did have alzheimer's disease. this is the concern and what they are looking for in these brains. >> specifically duerson's brain, i guess what specifically are they going to -- like you said it's a random process but when we hear the results will people be listening for? >> reporter: what is the answer be able to be given to the family...