PITTSBURGH, Penn. - Former University of Arkansas at Pine Bluff standout and Southwestern Athletic Conference Hall of Famer, L.C. Greenwood, passed away Sunday morning at the age of 67 due to natural causes.

The Allegheny County Medical Examiner's Office reported the passing to the Pittsburgh Tribune-Review just before noon on Sunday morning.

Greenwood, who played for Arkansas-Pine Bluff (Arkansas AM&N) from 1965-1969, was an All-Pro defensive end who won four Super Bowl rings as a member of Pittsburgh Steelers famed "Steel Curtain" defense.

A 10th-round draft pick in 1969, Greenwood helped make the Steelers the best franchise in the NFL in the 1970s. Greenwood found his place on a defensive line that included Mean Joe Greene, Ernie Holmes and Dwight White. Experts have named the unit one of the greatest defensive lines ever assembled.

Greenwood may have played his finest game in Super Bowl X. Although sacks would not become an official statistic in the NFL for six more years, the play-by-play from Super Bowl X says Greenwood sacked Cowboys quarterback Roger Staubach four times in that game. The official Super Bowl record for sacks in a game is three.

Recognized by his signature gold hightops, Greenwood was an Ebony All-American, six-time Pro Bowler, two-time All-Pro and a member of the NFL's All-Decade Team for the 1970s.