Postmortem CTE Diagnosis Confirmed in Late Dallas Cowboys Player Who Died by Suicide

Studies indicate that contact-sport athletes—including football and rugby players, as well as combat sports competitors—face a markedly elevated risk of chronic traumatic encephalopathy (CTE) compared with the broader public.

CTE can only be identified posthumously. The condition, triggered by recurrent head trauma, has been detected in the brains of numerous former National Football League (NFL) athletes.

According to the nonprofit CTE Society, early-stage manifestations may include short-term memory impairment, depression, aggression, and deficits in executive function.

As the disease progresses, these symptoms intensify and additional issues such as emotional instability and suicidal ideation may appear. In advanced stages, patients can suffer profound cognitive decline, memory loss, and dementia, the organization notes.

Boston University’s CTE Center emphasizes that suicide arises from multifaceted causes, and a postmortem CTE diagnosis is not established as a direct risk factor for suicide.

Nevertheless, CTE researchers argue this case demonstrates insufficient progress in reducing athletes’ exposure to the disease.

“Mr. Kneeland competed under modern concussion protocols and with improved helmet technology, yet still developed CTE,” stated Dr. Chris Nowinski, co-founder and CEO of the Concussion & CTE Foundation. “We have no evidence suggesting the current generation faces a lower CTE risk than those before it.”

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