Knox was available to the Seahawks after resigning as coach of the Bills - a team he had revived and led to two playoff berths in his last three years - following a contract dispute. "But at the same time, he really was a players' coach", Largent continued.
Knox is the only head coach in the Seahawks' Ring of Honor, having been inducted in 2005.
"The Seahawks family are saddened by the loss of Chuck Knox, and our deepest sympathies are extended to his wife, Shirley, and the entire Knox family", the team said in a statement. "He was one of many nice influences not exclusively in soccer, however in life".
He led Seattle to their first division title, playoff win and conference championship appearance and was the first coach in National Football League history to lead three different teams to the National Football League playoffs.
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The Seahawls also noted Knox's nickname, "Ground Chuck", a reference to his devotion to the running game and a hard-nosed approach to the sport. "The memories and accomplishments that Coach Knox left behind will continue to inspire us and Rams fans".
Knox was at the helm for the Bills from 1978-1982.
Knox was born in the suburbs of Pittsburgh in 1932 and played college football at Juniata College in Huntingdon, Pennsylvania. Knox had 80 victories and was the team's winningest coach until 2007.
He went on to be a high school coach, before moving onto colleges.
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A Pennsylvania native, Knox broke into professional soccer in 1963, when he was employed to be the offensive line coach for the AFL's New York Jets.
On social media players and coaches alike are mourning the passing of the beloved coach. Pete Carroll is third with 79.
After 1984, Knox coached seven more years in Seattle but only won 10 or more games once, in 1986.
"I never had a guy that breathed intensity into a group of men before kickoff as well as he did", said former Rams tackle Jackie Slater, whose Hall of Fame career was bookended by stints under Knox. "He always took the time to know each player well enough that he could talk to each player and hit their hot buttons".
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His granddaughter Lee Ann Knox also paid a touching tribute to Knox on Twitter on Sunday.