BEIJING " Jiang Yanyong, a Chinese military doctor who revealed the full extent of the 2003 SARS outbreak and was later placed under house arrest for his political outspokenness, has died, a long-time acquaintance and a Hong Kong newspaper said Tuesday. Jiang was 91 and died of pneumonia Saturday in Beijing, according to human rights activist Hu Jia and the South China Morning Post. News of Jiang's death and even his name were censored within China, underscoring how he remained a politically sensitive figure even late in life.