Former Pittsburgh Steelers defensive lineman L.C. Greenwood waving to fans in 2006. He died Sunday at the age of 67. Stephen M. Gross /UPI /Landov hide caption toggle caption Stephen M. Gross /UPI /Landov The Two-Way L.C. Greenwood, Part Of Pittsburgh's 'Steel Curtain,' Dies September 30, 2013 During the Steelers' glory years in the '70s when the team won four NFL Super Bowls, Greenwood teamed with "Mean" Joe Greene, Ernie Holmes and Dwight White on a much-feared defensive line. Greene is now the sole living member of that famous foursome.