Fred Lorenzen, a 2015 NASCAR Hall of Fame inductee (pictured at the induction ceremony below) and one of the sport's first superstars, is following modern-day star Dale Earnhardt Jr.'s pledge to donate his brain to the Concussion Legacy Foundation, spurred by his battle with dementia. His decision makes him the...

BMX star and former Subaru factory GRC driver Dave Mirra, who died from a self-inflicted gunshot wound in February, was found to have chronic traumatic encephalopathy (CTE), a progressive degenerative disease of the brain, ESPN The Magazine reports. Mirra is believed to be the first action sports athlete to be...