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.
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He played right guard between Hall of Famer offensive tackle Rayfield Wright (1970–1976) and Dave Manders (1970–1972) or John Fitzgerald (1973–1976) at center and helped anchor a dominant offensive line that led the Cowboys to three Super Bowls in that time.