 Pius XII died on 9 October 1958 of acute heart failure brought on by a sudden myocardial infarction in Castel Gandolfo , the papal summer residence . His doctor <unk> said afterwards : " The Holy Father did not die because of any specific illness . He was completely exhausted . He was overworked beyond limit . His heart was healthy , his lungs were good . He could have lived another 20 years , had he spared himself . " 
