MIAMI (AP) — For Cookie Gilchrist, brain damage accumulated during a football career that took him directly from high school to the NFL in the 1960s.

For his son Scott, the damage happened all at once when he fell 40 feet from scaffolding at his house under renovation in Toronto.

"I had a bad accident: bleeding of the brain and traumatic brain injury," says Scott, 56. "I have a better understanding of the last bunch of years with my dad and why he got frustrated and couldn't let things go."

Cookie Gilchrist, a fullback for the Bills, Broncos and Dolphins, began showing symptoms of brain damage...