The attorney for Aaron Hernandez announced Thursday that the family is suing the NFL and the New England Patriots after a study on the former star tight end's brain found advanced CTE.

"Aaron Hernandez had an advanced Stage 3 of CTE which is usually found in the median age of a 67-year-old man," Baez told reporters, per Chad Amaral of Boston 25 News. "My team has filed a federal lawsuit suing the NFL and the New England Patriots on behalf of Aaron Hernandez's daughter, Avielle Hernandez."

Following Hernandez's death in April, the family sent his brain to Boston University's CTE Center, which is considered among the best research labs in the country for the disease. After extensive study, researchers found that Hernandez had suffered from "atrophy and large perforations" on his brain.

The Boston University Center is also the research lab responsible for finding CTE in the brains of 110-of-111 former NFL players during a study released in The New York Times in July.