Former Pittsburgh Steelers defensive end L.C. Greenwood died Sunday of natural causes at age 67.
Greenwood, a Steeler for 13 years, died at 11:56 a.m. ET, according to the Allegheny County Medical Examiner's Office.
Greenwood had been treated at UPMC Presbyterian in Oakland, Pa., for an undisclosed reason and was hospitalized for multiple days last week.
Despite a resume that included four Super Bowls, two All-Pro honors and six Pro Bowls selections, Greenwood is not in the Pro Football Hall of Fame. He was a two-time finalist -- in 2005 and 2006.
Along with Joe Greene, Ernie Holmes and Dwight White, the Greenwood was part of one of the most dominant defensive line groups in NFL history.
He had 73.5 sacks and recovered 14 fumbles. His best-known single-game performance was in Super Bowl X, a Steelers' victory over the Dallas Cowboys. Greenwood sacked Roger Staubach four times in the game.
He retired in 1982 because of knee injuries.