The 'sign man' of Shea Stadium died Thursday, according to an ESPN News report. Karl Ehrhardt was a fixture at Mets' games, famous for holding up signs after key plays that displayed his pleasure or frustration with the team. He was 83 and died at his home in the Glen Oaks section of Queens, according to his daughter Bonnie Troester. Ehrhardt had been recovering from vascular surgery. Ehrhardt's block-lettered signs served as color commentary for both fans in the stands and TV viewers at home.