Aaron Hernandez’s brain was ‘severely impacted’ by CTE when he killed himself

FILE - In this Friday, April 14, 2017, file photo, Former New England Patriots tight end Aaron Hernandez turns to look in the direction of the jury as he reacts to his double murder acquittal at Suffolk Superior Court in Boston. Hernandez hung himself and was pronounced dead at a Massachusetts hospital early Wednesday, April 19, 2017, according to officials. (AP Photo/Stephan Savoia, Pool, File) Boston • A researcher says Aaron Hernandez suffered severe damage to parts of the brain that play an important role in memory, impulse control and behavior.

McKee says she could not say that Hernandez's behavior was a result of his severe case of chronic traumatic encephalopathy. But she says…