Tests conducted on the brain of former football star Aaron Hernandez showed severe signs of the degenerative brain disease chronic traumatic encephalopathy, and his attorney said Thursday that the player's daughter is suing the NFL and the New England Patriots for leading Hernandez to believe the sport was safe.
Per ESPN, Hernandez's attorney Jose Baez said the testing showed that Hernandez had one of the most severe cases of CTE ever diagnosed of a person of his age.
Hernandez was 27 when hein April.
"Dr. Ann McKee, the director of the CTE Center at Boston University, concluded that the New England Patriots tight end had stage 3 of 4 of the disease and also had early brain atrophy and large perforations in a central membrane," wrote ESPN.
"The $20 million lawsuit filed in federal court in Boston on Thursday claims that the team and league deprived Avielle Hernandez of the companionship of her father. It is separate from a $1 billion settlement in which the league agreed to pay families of players who suffered brain damage because of repeated head trauma while playing football."
An NFL spokesman said, "We have not seen a copy of the suit and cannot comment at this time."
CTE can be caused by repeated head trauma and leads to symptoms such as violent mood swings, depression and other cognitive difficulties. Hernandez killed himself in April in the jail cell where he was serving a life-without-parole sentence for a 2013 murder. His death came just hours before the Patriots visited the White House to celebrate their latest Super Bowl victory.
CTE can only be diagnosed in an autopsy. A recent study found evidence of the disease in 110 of 111 former NFL players whose brains were examined.
CTE has been linked with repeated concussions and involves brain damage in the frontal region. The is the area of the brain that controls functions including judgment, emotion, impulse control, social behavior and memory.
Hernandez was a star for the University of Florida when it won the 2008 title, but he dropped to the fourth round of the NFL draft because of trouble in college that included a failed drug test and a bar fight. His name had also come up in an investigation into a shooting.
"In three seasons with the Patriots, Hernandez joined Rob Gronkowski to form one of the most potent tight end duos in NFL history. In 2011, his second season, Hernandez caught 79 passes for 910 yards and seven touchdowns to help the team reach the Super Bowl, and he was rewarded with a $40 million contract," noted ESPN.