Dallas Cowboys defensive end Marshawn Kneeland had early-stage chronic traumatic encephalopathy when he died by suicide at age 24 in November, according to test results released by his family Tuesday through the Concussion & CTE Foundation .
"While this diagnosis does not change the tragedy of his passing, it provides important context about some of the struggles he may have been facing," Kneeland's family, including girlfriend Catalina Mancera, said in a statement.
CTE is a degenerative brain disease that has been found in people who experience repetitive head trauma and can be diagnosed only after death.
"We share this information to help people understand what NFL and other high contact sport athletes might be struggling with," the family said. "Raising awareness is important to us. We continue to remember Marshawn with compassion for the person he was, rather than defining him by the final moments of his life. One Love."
Read more: Cowboys DE Marshawn Kneeland dead at 24 from apparent self-inflicted gunshot wound
Frisco, Texas, police said Kneeland didn't stop when state Department of Public Safety troopers tried to pull him over on Nov. 5 for a traffic violation. The 2024 second-round draft pick was pursued by authorities in his vehicle and then on foot before being found "deceased with what appeared to be a self-inflicted gunshot wound," Frisco police said in a statement at the time.
Police-dispatch audio from the incident revealed that Kneeland had sent out a group text to say goodbye to his family.
Read more: Chicago Bears Pro Bowler Steve McMichael diagnosed with CTE a year after ALS death
Researchers at the Boston University CTE Center analyzed Kneeland's brain tissue and determined that the athlete, who started playing tackle football at age 7, was in stage one of four of CTE.
"Unfortunately, I was not surprised to find CTE in the brain of Mr. Kneeland, because we have found this progressive brain disease in nearly half of the athletes we've studied who have died before the age of 30," Dr. Ann McKee, the center's director, said in a statement.
"Thanks to the generosity of our brain donor families, we now better understand the earliest stages of CTE, and it is bringing us closer than ever to diagnosing it during life. My team and I are fully dedicated to finding effective treatments and a cure for CTE."
The Associated Press contributed to this report.
This story originally appeared in Los Angeles Times .
