Very sad to hear... from anyone.
I hope that studies can continue on head trauma and sports, and include ALL sports and that more athletes across the board donate their brain in the effort to understand CTE better.
If only football players that show symptoms donate, the sample sizes will continue to be too low. We need soccer players, hockey players, water polo players, basketball players etc to all participate.
I would also be interested to know if the ALS rate or rates of depression etc are greater in football players than other sports and just the general population.
(edit: in MMQB, says ALS death 4 times more likely in football players)