CTE Diagnosis Reveals Dark Truth About Football's Modern Safety Measures

When Marshawn Kneeland died by suicide in November 2025, the Cowboys pass rusher’s tragic passing sent shockwaves through the NFL and beyond. Eight months later, his story took on a sobering new dimension: Boston University’s CTE Center confirmed that the 24-year-old had Stage 1 chronic traumatic encephalopathy—a progressive brain disease linked to repeated head impacts.

The diagnosis alone is heartbreaking. But what makes Kneeland’s case particularly unsettling is what it says about the state of player safety in professional football. Despite playing in what many consider the modern era of concussion protocols and improved equipment, he still developed CTE. He appeared in just 18 NFL games across two seasons, yet had been playing tackle football since age seven. That’s two decades of accumulated impacts—most of them happening long before anyone was seriously talking about brain health in sports.

Dr. Ann McKee, director of BU’s CTE Center, wasn’t shocked by the finding. Nearly half of the athletes the center has studied who died before age 30 have been diagnosed with CTE. That’s a staggering statistic that demands attention. Stage 1 CTE is characterized by short-term memory loss, mild aggression and depression, and headaches—symptoms that can profoundly affect a person’s mental health and decision-making without anyone realizing what’s happening beneath the surface.

Chris Nowinski, CEO of the Concussion&CTE Foundation, put it plainly:“Concussion protocols do not prevent CTE, because CTE is caused by repeated head impacts, not just concussions.”This is the hard truth the football world has been reluctant to fully confront. You can mandate better helmets, enforce stricter return-to-play guidelines, and educate coaches about concussion awareness—and none of it stops the cumulative damage from day-to-day hits that don’t register as medical emergencies.

Kneeland’s girlfriend, Catalina Mancera, noted that while his diagnosis“does not change the tragedy of his passing, it provides important context about some of the struggles he may have been facing.”That context matters immensely. It shifts the conversation from individual tragedy to systemic risk, from a personal crisis to a public health issue embedded in a sport loved by millions.

The question now isn’t whether football will acknowledge this problem—it already has, on some level. The question is whether the sport will fundamentally rethink the way it protects players, particularly young ones who have decades of impacts ahead of them. Kneeland’s story suggests that incremental safety improvements may not be enough.