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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 in the 2012 deaths of Daniel de Abreu and Safiro Furtado, at Suffolk Superior Court in Boston.

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Doctor: Aaron Hernandez’s brain was severely damaged by disease

BOSTON — Former New England Patriots player Aaron Hernandez suffered substantial damage to parts of the brain that affect memory, judgment and behavior from the most severe case of a degenerative disease linked to head blows ever found in someone so young, a researcher said Thursday.