Who was the murderer of Abraham Lincoln?-- John Wilkes Booth
What were the conspirators plans?-- To kill Lincoln, Andrew Johnson, and William Seward
Who was involved?-- John Wilkes Booth, Lewis Powell, David Herold, and George Atzerodt
What were their reason for attack?-- John was a well known actor in the South, but once he came to the North he was ignored and I believe blamed what the president for what happened.The original plan was to kidnap the president and bring him to the South, the presidents plans changed. John W. Booth was no interested in killing the president.
Who else was killed that night?-- Lincoln was the only one to be killed that night. Johnson was never approached and Seward was stabbed but he didn't die.
I don't believe the assassins were successful that night. After Lincoln's death people came closer together. The killing of Lincoln, I think, brought the nation closer than it would've if Lincoln kept trying to convince them honestly.