Dossier
Concussion and CTE Foundation
Coverage of Concussion and CTE Foundation in the Nexus archive.
- Former Dallas Cowboys defensive end Kneeland had early stage CTE at time of death
Marshawn Kneeland, a Dallas Cowboys defensive end who died by suicide in 2025, was diagnosed with early-stage chronic traumatic encephalopathy (CTE) after his death. The Boston University CTE Center confirmed the diagnosis, linking it to repeated head trauma. Kneeland's family emphasized the importance of raising awareness about CTE in athletes.
- Cowboys defensive end Marshawn Kneeland posthumously diagnosed with CTE
Marshawn Kneeland, a Dallas Cowboys defensive end, was posthumously diagnosed with Stage 1 CTE after his death by suicide in November 2025. His family donated his brain for research, and Boston University’s CTE Center confirmed the diagnosis, highlighting the disease’s prevalence in young athletes.