Dossier
Ann McKee
Coverage of Ann McKee in the Nexus archive.
- 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.