Kevin Turner was a lead plaintiff in the class-action lawsuit against the NFL that was affirmed Monday. Turner died last month; he's seen here in a 2014 Senate hearing on the long-term effects of brain injuries. Charles Dharapak/AP hide caption

toggle caption
Charles Dharapak/AP

John Castello decided to stop playing football when he learned about the risks of brain injury. Dave Marmarelli/DGM Photography hide caption

toggle caption
Dave Marmarelli/DGM Photography

The Impact Of 'Concussion': High School Football Player Changes Course

  • Download
  • <iframe src="" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

The family of Derek Boogaard, who died in 2011, has sued the NHL, accusing the league of negligently causing his death. Ann Heisenfelt/AP hide caption

toggle caption
Ann Heisenfelt/AP