On 2 November, South Vietnamese president Ngo Dinh Diem was assassinated. The United States had earlier withdrawn its support. The assassination drew America even further into the Vietnamese conflict.
Richert, Lucas Paul. "Assassination of South Vietnamese leader". The Literary Encyclopedia. First published 01 November 2008
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5661, accessed 23 May 2013.]