Former Los Angeles Rams, Seattle Seahawks, and Buffalo Bills head coach Chuck Knox has died at 86 after a lengthy battle with dementia, the Seahawks confirmed.

Knox began his career as an offensive line coach for the New York Jets and Detroit Lions in the late 1960s and early 1970s, later becoming the Rams head coach from 1973-1977, and 1992-1994. He coached the Bills from 1978-1982, and Seattle from 1983-1991.

Known around the NFL as "Ground Chuck," Knox's offenses emphasized running the ball. He was a three-time Associated Press NFL Coach of the Year (1973, 1980, 1984).

Knox currently ranks 10th on the NFL's all-time head coaching wins list with 193 career victories.