John Wilkes Booth has just arrived at the back of the theater ready to go in and kill President Lincoln. He is ready to end what he believes has been wrong for so long.
John Wilkes Booth sneaks into the presidents box and fires his .44-caliber single-shot derringer pistol right into Lincolns head. He quickly rushes to get out and breaks his leg, but still makes it to his horse to escape.
One day later, Lincoln is proclaimed dead. Everyone is devastated. The president of the United States was just killed my a famous actor, now infamous for Lincoln's death.