At least 1 in 4 ex-NFL players who died from 2016 to 2021 had CTE, study finds

That's a much higher rate than is seen in the general population. CTE is a brain disease linked to repeated blows to the head.

Source: [CBS News](https://www.cbsnews.com/news/cte-ex-nfl-players-at-least-1-in-4-had-it-who-died-2016-to-2021-study/)