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A $30 million partnership between the NFL and the National Institutes of Health is set to expire at the end of August, with much of the NFL's pledged money unspent. Above, NFL Commissioner Roger Goodell in February. Bob Levey/Getty Images hide caption

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Bob Levey/Getty Images

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

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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

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Dave Marmarelli/DGM Photography

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

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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

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Ann Heisenfelt/AP