Iconic Pittsburgh Steelers defensive end L.C. Greenwood (pictured), one of the superstar cogs in the “Steel Curtain” defense that catapulted the team to four Super Bowls in the ’70s has passed away at age 67. The cause of death was kidney failure, according to the Pittsburgh Post-Gazette. SEE ALSO: Jonathan Ferrell: Hundreds Gather To Say Final Goodbyes […]