ATLANTA, GA - JANUARY 22: Clay Matthews #52 of the Green Bay Packers is blocked by Jake Matthews #70 of the Atlanta Falcons during the first quarter in the NFC Championship Game at the Georgia Dome on January 22, 2017 in Atlanta, Georgia. (Photo by Scott Cunningham/Getty Images)

Tragedy has struck one of the most famous families in all of football

We send our thoughts and best wishes out to the family.

According to John McClain of the Houston Chronicle, Clay Matthews Sr. has passed away on Thursday evening. He was 88.

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Matthews Sr. played college football at Georgia Tech, and he later played four years in the NFL. His NFL stint was split into two parts — both with the 49ers — as Matthews served in the Korean War after his rookie year in the league.

Matthews is perhaps best known for the legacy he has left in the NFL via his sons and grandsons. His two oldest sons, Clay Jr. and Bruce, each played 19 seasons in the NFL, with Bruce being elected to the Pro Football Hall of Fame in 2007. Those two have produced five NFL playing sons of their own, most notably linebacker Clay Matthews III with the Packers and Jake Matthews with the Atlanta Falcons.

According to the Chronicle, services will be held for Matthews in both South Carolina and California.