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Cowboys defensive lineman Marshawn Kneeland died by suicide in November 2025 at age 24. His family has released the results of a post-mortem brain tissue analysis performed by the Concussion & CTE Foundation.
Via a release from the Concussion & CTE Foundation, Boston University CTE Center researchers diagnosed Kneeland with stage 1 chronic traumatic encephalopathy (CTE).
Stage 1 is the lowest level, on a scale of 1 to 4.
“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, director of the Boston University CTE Center, said. “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.”
CTE still can be diagnosed only by studying the brain tissue of a patient who has died.
Via a release from the Concussion & CTE Foundation, Boston University CTE Center researchers diagnosed Kneeland with stage 1 chronic traumatic encephalopathy (CTE).
Stage 1 is the lowest level, on a scale of 1 to 4.
“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, director of the Boston University CTE Center, said. “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.”
CTE still can be diagnosed only by studying the brain tissue of a patient who has died.
