BOSTON (AP) — Former Oakland Raiders quarterback Ken Stabler, an NFL and Super Bowl MVP who is a finalist for the Pro Football Hall of Fame, has been diagnosed with the brain disease CTE, Boston University researchers said Wednesday.

Stabler, who died of colon cancer at 69 in July, had Stage 3 chronic traumatic encephalopathy, Dr. Ann McKee told The Associated Press. McKee said the disease was widespread throughout his brain, with “severe” damage to the regions involving learning, memory and regulation of emotion.

The diagnosis was first reported by The New York Times.

The disease, which can only be diagnosed after death, is linked to repeated brain trauma and associated with symptoms such as memory loss, depression and progressive dementia. CTE has been found in the brains of dozens of former football players.