Short answers, pulled from the story.
The Battle of Bataan began on the 7th of January 1942 and ended when Major General Edward P. King surrendered to Colonel Motō Nakayama on April 9. Prisoners started marching from Mariveles on April 10 and from Bagac on April 11.
Stanley L. Falk calculated death numbers showing 600 to 650 American deaths and 5,000 to 10,000 Filipino deaths. Other sources report ranges from 5,000 to 18,000 Filipino deaths and 500 to 650 American deaths during the march itself.
Colonel Masanobu Tsuji issued clandestine orders to kill all American captives despite General Homma's wishes for peaceful transfer. The first major atrocity occurred when approximately 350 to 400 Filipino officers were executed in the Pantingan River massacre.
It was not until the 27th of January 1944 that the U.S. government informed the American public about the march. Sworn statements from escaped military officers were released that day followed by stories in a Life magazine article.
Masaharu Homma was arrested by Allied troops in September 1945 and indicted for war crimes. He received a death sentence by firing squad on the 26th of February 1946 and was executed outside Manila on April 3.