Replacing the old Eastern and Western conferences (although divisions from those conferences still existed but were renamed to suit the realignment), the new conferences, AFC and NFC, function similar to Major League Baseball's American and National leagues, and each of those two were divided into three divisions: East, Central, and West.
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In 1967 during pre-season, he suffered a career-threatening right knee injury and missed the entire season, upon his return he served as a backup to Mike Connelly and Malcolm Walker, until he returned to form and took his job back in 1970.
In the 1970 NFC title game, Renfro had a key interception that led to the Cowboys' game-winning touchdown over the San Francisco 49ers that helped them get to Super Bowl V, where they lost to the Baltimore Colts.