Ann McKee, the head of BU's CTE Center, which has studied the disease caused by repetitive brain trauma for more than a decade, called Hernandez's brain "one of the most significant contributions to our work" because of the brain's pristine condition and the rare opportunity to study the disease in a 27-year-old.
Hernandez, a former New England Patriots tight end, hanged himself with a bedsheet in April in a Massachusetts prison while serving a life sentence for the murder of Odin Lloyd in 2013.
In a diagnosis that linked one of football's most notorious figures with the sport's most significant health risk, doctors found Hernandez had Stage 3 CTE, which researchers had never seen in a brain younger than 46 years old, McKee said.