Litsky, Frank. "Craig Heyward, Who Was N.F.L.'s Ironhead, Is Dead at 39", The New York Times, May 29, 2006. "He would lower his head into tacklers' stomachs, and one opponent said it hurt so much that Heyward's head had to be made of iron. Once, Heyward said, a youngster clubbed him over his size 8¾ head with a billiard cue. The cue broke in half."
