On 12 April, 32nd President of the United States Franklin Delano Roosevelt died while sitting for a portrait and vice-president Harry Truman was sworn into the office of the presidency.
Richert, Lucas Paul. "Death of Roosevelt; Truman becomes President". The Literary Encyclopedia. First published 01 October 2008
[http://www.litencyc.com/php/stopics.php?rec=true&UID=3139, accessed 28 March 2015.]