Aaron Hernandez's lawyer says the former New England Patriots tight end's brain showed severe signs of the degenerative brain disease chronic traumatic encephalopathy.
In a news conference at his offices, attorney Jose Baez says testing showed that Hernandez had a severe case of the disease.
CTE can be caused by repeated head trauma and leads to symptoms like violent mood swings, depression, and other cognitive difficulties.
Hernandez's family is also suing the NFL. To read the lawsuit, click here.
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.
Copyright 2017 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.