His passing was noted in a Great Debates thread on football concussions last night; there, I posted a link to the story about his death in the Fort Worth Star-Telegram, where they noted he had had several mental health evaluations since his retirement, and a run-in with the law a couple of years ago, in which it sounds like he rammed his body into a couple of cars.
The article also contained a tweet from last year, from his former teammate Dez Bryant, who described Barber as being “down and out bad.”
Between all of that, and the fact that Barber had a very physical running style, I wouldn’t be surprised if he had suffered from CTE.