Longtime NFL coach Knox dies at 86

Chuck Knox, a longtime NFL coach who won 186 regular-season games, died Sunday at age 86, the Seattle Seahawks confirmed.

Knox's granddaughter, Lee Ann, originally announced the news on Twitter.

Knox reportedly was suffering from dementia and recently entered hospice care.

Knox coached for the Los Angeles Rams (twice), Buffalo Bills and Seattle Seahawks during his 22 seasons as a head coach. His regular-season record was 186-147-1 and he went 7-11 in postseason play.

He guided four teams to conference championship games -- the Rams three times in the 1970s and the Seahawks in 1983 -- but never reached a Super Bowl.

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Longtime NFL coach Chuck Knox dies at 86
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Longtime NFL coach Chuck Knox dies at 86
ANAHEIM, CA - OCTOBER 2: Head coach Chuck Knox of the Los Angeles Rams watches the game against the Atlanta Falcons at Anaheim Stadium in Anaheim, California, on October 2, 1994. The Falcons won 8-5. (Photo by Bernstein Associates/Getty Images)
ANAHEIM, CA - SEPTEMBER 12: Head coach Chuck Knox of the Los Angeles Rams watches the game against the Pittsburgh Steelers at Anaheim Stadium in Anaheim, California, on September 12, 1993. The Rams won 27-0. (Photo by Bernstein Associates/Getty Images)
Former Seahawks head coach Chuck Knox waits on the bench before he is honored at halftime by the Seattle Seahawks. His name was added to the Ring of Honor at Qwest Field during the Arizona Cardinals vs. Seattle Seahawks game in Seattle on Saturday Sept. 24 2005. (Photo by Kevin Casey/NFLPhotoLibrary)
27 DEC 1992: LOS ANGELES HEAD COACH CHUCK KNOX ON THE SIDELINE DURING THE RAMS GAME VERSUS THE ATLANTA FALCONS AT ANAHEIM STADIUM IN ANAHEIM, CALIFORNIA. Mandatory Credit: Ken Levine/ALLSPORT
BUFFALO, NY - SEPTEMBER 6: Head coach Chuck Knox of the Los Angeles Rams focuses on play from the sideline during the game against the Buffalo Bills at Rich Stadium on September 6, 1992 in Buffalo, New York. The Bills defeated the Rams 40-7. (Photo by Rick Stewart/Getty Images)
12-9-1988 (Special for Denver post; Auth.ED.John Hebersly) (SE7-Dec.8) Special--Coach Chuck Knox of the Seattle Seahawks turned his hat around to demonstrate blocking to a group of players during the NFL squad's training camp last year. (AP Lasercolor) (gds51527stf/gds)1988 (file photo dated July 22,1987) Knox, Chuck (Denver Post via Getty Images)
KANSAS CITY, MO - NOVEMBER 20: Head coach Chuck Knox of the Seattle Seahawks watches the NFL game against the Kansas City Chiefs at Arrowhead Stadium on November 20, 1988 in Kansas City, Missouri. The Chiefs defeated the Seahawks 27-24. (Photo by Jonathan Daniel/Getty Images)
ANAHEIM, CA - CIRCA 1992: Head Coach Chuck Knox of the Los Angeles Rams looks on from the sidelines during an NFL football game circa 1992 at Anaheim Stadium in Anaheim California. Knox coached the from 1973-77 and 1992-94. (Photo by Focus on Sport/Getty Images)
Unspecified - 1985: Chuck Knox, Los Angeles Rams vs Seattle Seahawks gameplay. (Photo by ABC via Getty Images)
1986: Head coach Chuck Knox of the Seattle Seahawks watches from the sidelines during the 1986 NFL game. (Photo by Rick Stewart/Getty Images)
(Original Caption) Seattle, Washington: Chuck Knox holds a press conference after the Seattle Seahawks named him head coach of the team 1/26. Knox, who has guided teams to the NFL playoffs in seven of the past 10 seasons, resigned as head coach of the Buffalo Bills 1/25.
UNSPECIFIED - CIRCA 1983: Head Coach Chuck Knox of the Seattle Seahawks talks with Gene Upshaw prior to the start of an NFL football game circa 1983. Knox coached the Seahawks from 1983-91. (Photo by Focus on Sport/Getty Images)
CIRCA 1980's: Head Coach Chuck Knox (R) of the Buffalo Bills talks with his quarterback Joe Ferguson #12 on the sidelines during a early circa 1980's NFL football game. Knox was the head coach of the Bills from 1978-82. (Photo by Focus on Sport/Getty Images)
BUFFALO, NY - CIRCA 1980's: Head Coach Chuck Knox (C) of the Buffalo Bills walking off the field after an early circa 1980's NFL football game at Rich Stadium in Buffalo, New York. Knox was the head coach of the Bills from 1978-82. (Photo by Focus on Sport/Getty Images)
Current Seattle Seahawks' head coach Mike Holmgren (R) shakes hands with former Seahawks' head coach Chuck Knox during ceremonies ending the final regular season home game at the Kingdome in Seattle, December 26. The Kingdome is to be demolished in March, 2000 and a new stadium will be built on the same location, to open in 2002. Knox was Seahawks' head coach from 1983-1991. APB/HB
(Original Caption) New York: Buffalo coach Chuck Knox waves to Jet coach Walt Michaels across the field after the Bills defeated the Jets in the playoff opener December 27th. t left wearing a happy grin is Bills' Fred Smerlas.
ORCHARD PARK, NY - NOVEMBER 12: Head coach Chuck Knox of the Buffalo Bills looks on from the sideline during a game against the Miami Dolphins at Rich Stadium on November 12, 1978 in Orchard Park, New York. Miami defeated Buffalo 25-24. (Photo by George Gojkovich/Getty Images)
CIRCA 1980's: Head Coach Chuck Knox of the Buffalo Bills watching the action from the sidelines during an early circa 1980's NFL football game. Knox was the head coach of the Bills from 1978-82. (Photo by Focus on Sport/Getty Images)
SAN FRANCISCO, CA - NOVEMBER 4: Head coach Chuck Knox of the Los Angeles Rams looks on from the sidelines during an NFL game against the San Francisco 49ers on November 4, 1974 at Candlestick Park in San Francisco, California. (Photo by Martin Mills/Getty Images)
CIRCA 1980's: Head Coach Chuck Knox of the Buffalo Bills talks with his quarterback Joe Ferguson #12 on the sidelines during a early circa 1980's NFL football game. Knox was the head coach of the Bills from 1978-82. (Photo by Focus on Sport/Getty Images)
CIRCA 1980's: Head Coach Chuck Knox of the Buffalo Bills in this portrait on the field circa early1980's before an NFL football game. Knox was the head coach of the Bills from 1978-82. (Photo by Focus on Sport/Getty Images)
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Knox was named NFL Coach of the Year three times (1973, 1980 and 1984) and was tabbed "Ground Chuck" for his run-first offenses.

Knox was an offensive line coach before landing the Rams' job in 1973 and going 12-2, the first of five straight 10-win seasons with the franchise.

He departed after the 1977 season to take over the Buffalo Bills and he guided the team to two playoff appearances in five seasons. The sides parted ways due to contract dispute following the 1982 season.

Knox was hired by the Seahawks and made the playoffs in four of his six seasons and his 80-63 record stands for second-most wins in franchise history behind Mike Holmgren (86-74). Knox departed following the 1991 campaign after a second losing season in a three-year span.

Knox returned to the Rams and experienced three straight poor seasons -- going 15-33 from 1992-94 -- to end his NFL head-coaching career.

--Field Level Media

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