Attorney Jose Baez said Thursday that former New England Patriots player Aaron Hernandez, who killed himself in prison, had advanced CTE.
CTE -- chronic traumatic encephalopathy -- is a degenerative brain disease linked to repeated blows to the head. It has been diagnosed in NFL players. CTE can only be confirmed upon death.
"Aaron suffered from a severe case of CTE. This is the most severe case for someone of his age," Baez, noting that it was comparable to that of a 67-year-old man.
Baez said a lawsuit was filed Thursday afternoon on behalf of Hernandez's daughter against the NFL and the Patriots.
Hernandez was convicted of killing semi-pro football player Odin Lloyd in North Attleborough. He was acquitted earlier this year in the killings of two Boston men.
He was found hanged at the Souza-Baranowski prison in Massachusetts on April 19.
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