When Roosevelt returned to the United States from the Yalta Conference , many were shocked to see how old , thin and frail he looked . He spoke while seated in the well of the House , an unprecedented concession to his physical incapacity . During March 1945 , he sent strongly worded messages to Stalin accusing him of breaking his Yalta commitments over Poland , Germany , prisoners of war and other issues . When Stalin accused the western Allies of plotting behind his back a separate peace with Hitler , Roosevelt replied : " I can not avoid a feeling of bitter resentment towards your informers , whoever they are , for such vile misrepresentations of my actions or those of my trusted subordinates . " On March 29 , 1945 , Roosevelt went to the Little White House at Warm Springs , Georgia , to rest before his anticipated appearance at the founding conference of the United Nations . On the afternoon of April 12 , Roosevelt said , " I have a terrific headache . " He then slumped forward in his chair , unconscious , and was carried into his bedroom . The president 's attending cardiologist , Dr. Howard Bruenn , diagnosed the medical emergency as a massive intracerebral hemorrhage . At 3:35 p.m. that day , Roosevelt died at the age of 63
founding conference
United Nations Conference on International Organization
Franklin D. Roosevelt