. "ed.When I read what happened to Junior Seau and Dave Duerson ??? they didn't sleep, had wild mood swings, and shot themselves in the chest ??? I wanted to know what I was going through before something happened, he said.There is much that is not known about CTE, including why some athletes with a history of head blows never get dementia or other debilitating symptoms, who is most prone and whethe" . . .