Former UN Chief Javier Perez de Cuellar Passes Away at 100 Leave a Comment / Daily News, Obituary / By admin1 Former UN Chief Javier Perez de Cuellar Passes Away at 100 Former UN Chief Javier Perez de Cuellar, has passed away. He was 100. The former diploma served as United Nations Secretary General from 1981 to 1991.