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Cowboys DE Marshawn Kneeland Diagnosed with Stage-1 CTE After Suicide

7/8/2026

Summary

Kneeland Diagnosed CTE

Cowboys defensive end Marshawn Kneeland was diagnosed with Stage 1 CTE after his suicide on Nov 5–6, 2025.
His family and girlfriend Catalina Mancera said the diagnosis gives context for his struggles and urges sports changes.
The Boston University CTE Center said suicide is complex and the CTE finding should not be taken as its cause.
Dr. Ann McKee said many athletes who die before age 30 show CTE and urged earlier detection.

Summary

Cowboys Launch Fund

The Dallas Cowboys announced a memorial fund for Catalina Mancera and son Makhai, born June 11.
Head coach Brian Schottenheimer said the organization will honor Kneeland’s memory, expand mental-health resources, and the NFL will review player-wellness protocols.
The team played its game after Kneeland’s death on November 17 at Allegiant Stadium, facing the Las Vegas Raiders.
Cowboys assistant Aaron Whitecotton used Men’s Mental Health Awareness Month to call for broader athlete support.

History

Historical Context

Mike Webster’s 2009 posthumous CTE diagnosis, the first confirmed in a former NFL player, sparked nationwide scrutiny. Dr. Ann McKee’s Boston University CTE Center later confirmed CTE in 99 percent of 111 examined ex-NFL brains, reinforcing the link. That precedent drives today’s Stage 1 CTE finding in Marshawn Kneeland and the Dallas Cowboys’ memorial fund, prompting expanded NFL mental-health protocols.

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Kneeland Diagnosed CTE

Cowboys defensive end Marshawn Kneeland was diagnosed with Stage 1 CTE after his suicide on Nov 5–6, 2025.
His family and girlfriend Catalina Mancera said the diagnosis gives context for his struggles and urges sports changes.
The Boston University CTE Center said suicide is complex and the CTE finding should not be taken as its cause.
Dr. Ann McKee said many athletes who die before age 30 show CTE and urged earlier detection.

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