Former President S R Nathan suffers stroke . . SINGAPORE: Former President S R Nathan suffered a stroke early Sunday morning (Jul 31), said a statement from the Prime Minister's Office. The statement added that he is in critical condition in the Intensive Care Unit at Singapore General Hospital. Mr Nathan, 92, suffered a stroke on Apr 14 last year. Following that his family said he was recovering and undergoing therapy. Mr Nathan was the sixth and longest-serving President in Singapore, and was in office for two terms from 1999 to 2011. He officially stepped down as President on Aug 31, 2011 after announcing that he would not seek a third term in office. He was succeeded by President Tony Tan Keng Yam. After stepping down as President, Mr Nathan took up appointments as Distinguished Senior Fellow at the Institute of Southeast Asian Studies and at the Singapore Management University's School of Social Sciences. Prior to becoming President, he held key positions in the civil service, in security, intelligence and foreign affairs. He was appointed as Singapore's High Commissioner to Malaysia in 1988 and later Singapore's Ambassador to the United States of America from 1990 to 1996. He also served as Singapore's Ambassador-at-Large, and later pro-chancellor of the National University of Singapore.