A team of scientists who analyzed the brain tissue of renowned NFL linebacker Junior Seau after his suicide last year have concluded the football player suffered a debilitating brain disease likely caused by two decades worth of hits to the head, researchers and his family exclusively told ABC News and ESPN.
In May, Seau, 43 -- football's monster in the middle, a perennial all-star and defensive icon in the 1990s whose passionate hits made him a dominant figure in the NFL -- shot himself in the chest at his home in Oceanside, Calif., leaving behind four children and many unanswered questions.
Seau's family donated his brain to neuroscientists at the National Institutes for Health who are conducting ongoing research on traumatic brain injury and football players.
A team of independent researchers who did not know they were studying Seau's brain all concluded he suffered from chronic traumatic encephalopathy (CTE), a degenerative disease typically caused by multiple hits to the head.
"What was found in Junior Seau's brain was cellular changes consistent with CTE," said Dr. Russell Lonser, chairman of the Department of Neurological Surgery at Ohio State University, who led the study of Seau's brain while he was at NIH.
Patients with CTE, which can only be diagnosed after death, display symptoms "such as impulsivity, forgetfulness, depression, [and] sometimes suicidal ideation," Lonser said.
Seau's family described to ABC News and ESPN a long descent into depression in the years prior to his death.
