Former Cowboys Defensive End Marshawn Kneeland Diagnosed with Early-Stage CTE at Age 24 Upon His Death
Former Dallas Cowboys defensive end Marshawn Kneeland, who died by suicide in November 2025, had early-stage chronic traumatic encephalopathy (CTE), a brain condition linked to repeated concussions. His family revealed the diagnosis after the Boston University CTE Center analyzed his brain tissue posthumously. At 24, he was in stage one of four for CTE, which can cause mood swings, depression, and impulsive behavior. Kneeland’s tragic end came after a police chase, during which he sent a goodbye text, suggesting suicidal thoughts. His family emphasized the need for awareness regarding CTE and its impact on athletes.
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