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Hernandez had 'severe' case of CTE: lawyer

Former Patriots tight end Aaron Hernandez killed himself in his prison cell in April. (AAP)

Former Patriots tight end Aaron Hernandez, who killed himself in prison in April, had 'the most severe' case of CTE ever seen, his family lawyer has revealed.

The daughter of former New England Patriots player Aaron Hernandez, who killed himself in April after being acquitted in his second murder trial, has sued the league and the team after tests revealed her father had a "severe case" of the brain disease chronic traumatic encephalopathy.

Relatives of the 27-year-old former athlete had asked that his brain be tested for CTE after his body was found hanging in a Massachusetts prison where he was serving a life sentence for the 2013 murder of an acquaintance.

Researchers at Boston University, the leading centre studying CTE, assessed Hernandez's brain, said attorney Jose Baez, who successfully defended the athlete in a double-murder case this year.

"It was the most severe case they had ever seen," Baez told reporters in Boston. "It was an advanced stage."

CTE is linked to the sort of repeated head traumas common in football that can lead to aggression and dementia.

Hernandez's daughter, Avielle, on Thursday sued the Patriots and the National Football League in federal court in Boston, citing the CTE finding and seeking unspecified financial damages for the loss of her father.

Representatives of the NFL, the Patriots and Boston University did not immediately respond to requests for comment.

Hernandez had a $41 million NFL contract when he was arrested at his home in June 2013 and charged with murder. Prosecution witnesses at his two trials painted a picture of a troubled man with a history of drug use and paranoid tendencies.

A judge earlier this year vacated that conviction, because Hernandez had not exhausted all his avenues of appeal by the time he died, a move allowed by a quirk in Massachusetts law. Prosecutors are appealing that decision.

He was found not guilty in April of separate charges of fatally shooting two men outside a Boston nightclub in 2012.

Source AAP

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