Greenwood won four Super Bowls with the Steelers, having played for them from 1969-81.
Along with Ernie Holmes, Joe Greene and Dwight White, Greenwood added to the Steelers' infamous "Steel Curtain" defensive line - a unit that prided itself on the complete domination of the line of scrimmage. The Minnesota Vikings rushed for 1.9 yards a carry in Pittsburgh's 16-6 victory in Super Bowl IX - the first of six championships the Steelers would win.
His 73.5 sacks would be second in franchise history if the league kept sacks statistics during his days, writes Ray Fittipaldo of the Post-Gazette.
He was named to two All-Pro teams and five Pro Bowls in his career, which started after he was drafted in the 10th round out of Arkansas AM&N, which is now Arkansas Pine Bluff.
L.C. Greenwood was one of the all-time great Steelers and one of the leaders of the legendary "Steel Curtain" defense in the 1970s. L.C. was one of the most beloved Steelers during the most successful period in team history and he will be missed by the entire organization. He will be forever be remembered for what he meant to the Steelers both on and off the field. Our thoughts and prayers go out to his entire family.