Stephen M. Archer, "Booth, John Wilkes," American National Biography Online, February 2000, http://www.anb.org/articles/04/04-01210.html.
The kidnapping plot evaporated when the city of Richmond fell and the war ended. Five days later, on 14 April 1865, Booth learned that President Lincoln planned to attend Our American Cousin (starring Laura Keene) at Ford's Theatre. Working quickly, Booth assigned Atzerodt to assassinate Vice President Andrew Johnson and Payne to kill Secretary of State William Seward while Booth himself murdered Lincoln. Atzerodt lost his nerve and made no attempt on Johnson, but Payne, a young giant, wounded Seward severely, as well as several others who tried to defend him.