John Wilkes Booth.
His co-conspirators included Samuel Arnold, Michael O'Laughlen, John Surratt, Lewis Powell (alias Paine or Payne), George Atzerodt, and David Herold. Additionally, Booth met with Dr. Samuel Mudd both in Maryland (where Mudd lived) and Washington, and he began using Mary Surratt's boardinghouse to meet with his co-conspirators.
