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Former Dallas Cowboys defensive end Marshawn Kneeland had Stage 1 CTE when he died by suicide last fall, according to a post-mortem analysis released by the Concussion and CTE Foundation on Tuesday.
The foundation said Kneeland’s family released the results of a post-mortem brain tissue analysis done at the Boston University CTE Center that diagnosed Kneeland with Stage 1 (of 4) chronic traumatic encephalopathy.
The foundation defines CTE as “a degenerative brain disease linked to repeated traumatic brain injuries, including concussions and nonconcussive impacts,” and said it is most often identified in contact sport athletes and military veterans with long histories of repetitive head trauma. Diagnosis requires post-mortem testing of brain tissue and therefore cannot yet be made in living patients, though research is ongoing to develop a way to detect the disease while the patient is alive.
Kneeland’s family, including his girlfriend, Catalina Mancera, said the diagnosis highlights what athletes in high-contact sports may be dealing with.
“While this diagnosis does not change the tragedy of his passing, it provides important context about some of the struggles he may have been facing. We share this information to help people understand what NFL and other high-contact sport athletes might be struggling with. Raising awareness is important to us. We continue to remember Marshawn with compassion for the person he was, rather than defining him by the final moments of his life. One Love.”
The foundation said in their statement that “a post-mortem CTE diagnosis should not be considered the cause of a suicide and is not known to be a risk factor for suicide.”
Kneeland was 24 years old last November when he was involved in a brief pursuit with Texas State Troopers who said they attempted to pull him over on the Dallas North Tollway for a traffic violation. The DPS said they lost sight of the driver and terminated the pursuit, but that the vehicle was later found abandoned after a crash on Dallas Parkway near Warren Parkway, not far from the Dallas Cowboys headquarters in Frisco. The DPS said they joined the Frisco Police Department in a search of the immediate area and found the driver, identified as Kneeland, at about 1:30 a.m., deceased from a self-inflicted gunshot wound. Plano Police said they were asked to do a welfare check at Kneeland’s home earlier in the evening after a friend received a concerning text from Kneeland saying “goodbye,” but that no one was home when officers arrived.
“Unfortunately, I was not surprised to find CTE in the brain of Mr. Kneeland, because we have found this progressive brain disease in nearly half of the athletes we’ve studied who have died before the age of 30,” said Dr. Ann McKee, director of the Boston University CTE Center and chief of neuropathology for the VA Boston Healthcare System. “Thanks to the generosity of our brain donor families, we now better understand the earliest stages of CTE, and it is bringing us closer than ever to diagnosing it during life. My team and I are fully dedicated to finding effective treatments and a cure for CTE.”
Dr. Chris Nowinski, Concussion & CTE Foundation CEO, said despite having access to better helmets and concussion protocols, there is no reason to believe modern football players are at any lower risk of developing CTE than previous generations. Nowinski said CTE is caused by repeated head impacts, not just concussions, and that to reduce the risk of CTE the number of impacts must be reduced at every level of the game.
The Concussion & CTE Foundation encourages anyone worried about suspected CTE symptoms to reach out to their HelpLine team for medical recommendations and support at ConcussionAndCTE.org/Helpline.
If you or someone you know is in crisis, call or text 988 to reach the Suicide and Crisis Lifeline or chat live at 988lifeline.org — callers will be connected with trained counselors available 24 hours a day, seven days a week. You can also visit SpeakingOfSuicide.com/resources for additional support.
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| # | Наименование новости | Тональность | Информативность | Дата публикации |
|---|---|---|---|---|
| 1 | Former Dallas Cowboys defensive end Kneeland had early stage CTE at time of death | -1 | 7 | 07-07-2026 |
| 2 | Former Dallas Cowboys defensive end Kneeland had early stage CTE at time of death | -2 | 7 | 07-07-2026 |
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