Former Dallas Cowboys defensive end Marshawn Kneeland, who died by suicide in November 2025 after a high-speed chase with police, was diagnosed with Stage 1 of CTE.

AUSTIN, Texas (AP) — Former Dallas Cowboys defensive end Marshawn Kneeland, who died by suicide in November 2025 after a high-speed chase with police, had early stage chronic traumatic encephalopathy, a brain abnormality linked to repeated concussions, his family announced Tuesday. The Boston University CTE Center, which investigates the long-term consequences of repetitive brain trauma […]

Former Dallas Cowboys DE Marshawn Kneeland had Stage 1 CTE when he died by suicide last fall, according to a post-mortem analysis released Tuesday.

Former Dallas Cowboys defensive end Marshawn Kneeland had stage 1 CTE when he died by suicide in November 2025, according to a post-mortem brain tissue analysis performed by the Concussion & CTE Foundation.