His death was announced by the team. Blair, who had been suffering from dementia, died Thursday after an extended period in hospice care, according to the Star Tribune.
?He?d been suffering for a while, so I guess maybe it?s a blessing in disguise,? former teammate Scott Studwell told the newspaper. ?But it?s still too young. It?s a sad day.?
Vikings owner Mark Wilf said in a statement: ?Matt Blair was a great presence at Vikings events and a tremendous teammate long after playing. He embodied the best of what it means to be a Viking. Matt is a Ring of Honor player whose legacy will live on forever with the franchise and in the community he loved.?
Drafted in the second round out of Iowa State in 1974, Blair played all 12 of his NFL seasons for the Vikings, from 1974 to 1985. He started 130 of the 160 regular-season games he played, racking up 1,452 tackles, the second most in team history.
He finished his career with 16 interceptions, 20 fumble recoveries and 20 blocked punts, extra points and field goals.
In a 2015 interview with the Star Tribune, then-64-year-old Blair began crying, saying a neurologist told him and his wife, Mary Beth, that his early signs of dementia were likely the result of chronic traumatic encephalopathy, or CTE, a degenerative brain disease linked to concussions. CTE cannot be diagnosed until after death.