Marshawn Kneeland Diagnosed With Stage 1 CTE Following His Death at Age 24

Diagnosis and Findings from the Boston University CTE Center

Boston University researchers have diagnosed former Dallas Cowboys defensive end Marshawn Kneeland with Stage 1 chronic traumatic encephalopathy (CTE) following his death in November 2025. Kneeland, who was 24, died by suicide after a high-speed police chase. His family released the findings this week to provide context regarding his struggles. Diagnosis and Findings from the … Read more

Former 49ers All-Pro Aldon Smith Dies at 36 After Charity Shift, Family Seeks CTE Answers

Final Hours: A Charity Run and a Sudden Passing

Aldon Smith, a former 49ers All-Pro defensive end whose 2013 NFL Defensive Player of the Year season helped lead San Francisco to a Super Bowl appearance, died at 36 on June 13, 2024, after spending his final hours delivering pizzas for a Bay Area homeless charity, according to The New York Times. His family has … Read more

Claude Lemieux’s Brain Donated to Boston University CTE Center for Research

A Legacy of Playoff Dominance and Intensity

The family of NHL legend Claude Lemieux announced Saturday that his brain will be donated to the Boston University CTE Center to advance research into the long-term effects of repetitive head trauma. Lemieux, a four-time Stanley Cup champion who played nearly 1,500 games between 1983 and 2009, died of suicide on Thursday at age 60. … Read more