Mary Todd Lincoln in the context of "Séance"

Assassination is the willful killing, by a sudden or secret attack, of a person—especially a prominent or important one—typically for political or ideological reasons.

Assassinations may be ordered by both individuals and organizations and carried out by their accomplices. Acts of assassination have been performed since ancient times. A person who carries out an assassination is called an assassin.

On April 14, 1865, Abraham Lincoln, the 16th president of the United States, was shot at Ford's Theatre in Washington, D.C., one month into his second term and towards the conclusion of the American Civil War. Lincoln was watching the play Our American Cousin with his wife Mary Todd, Major Henry Rathbone, and Rathbone's fiancé Clara Harris when John Wilkes Booth, an actor and Confederate sympathizer, shot him in the head. Lincoln was taken to the Petersen House across the street, where he died the following morning.

With Union victory imminent, Booth and his conspirators, including Lewis Powell, David Herold, and George Atzerodt, originally plotted to kidnap Lincoln to aid the Confederacy. After that plan failed to materialize, they decided to assassinate him, Secretary of State William H. Seward, and Vice President Andrew Johnson. Booth hoped that eliminating the three most important officials of the federal government would revive the Confederate cause. Powell and Herold were assigned to kill Seward, while Atzerodt was assigned to kill Johnson. Booth succeeded in killing Lincoln, but Powell only managed to wound Seward, while Atzerodt became drunk and never targeted Johnson.

Henry Reed Rathbone (July 1, 1837 – August 14, 1911) was a United States military officer and lawyer who was present at the assassination of President Abraham Lincoln; Rathbone and his fiancée Clara Harris were sitting with Lincoln and Lincoln's wife Mary Todd Lincoln when the president was shot by John Wilkes Booth at Ford's Theatre.

When Rathbone attempted to apprehend Booth, Booth stabbed and seriously wounded him. Rathbone may have played a part in Booth's leg injury. His mental state deteriorated afterwards, and in 1883, he killed his wife, Clara; he was declared insane and lived the rest of his life in a lunatic asylum.

The Lincoln Tomb is the final resting place of Abraham Lincoln, the 16th president of the United States; his wife Mary Todd Lincoln; and three of their four sons: Edward, William, and Thomas. It is located in Oak Ridge Cemetery in Springfield, Illinois.

Constructed of granite, the tomb has a tall, story-and-a-half base in trapezoidal form, surmounted by an obelisk, with a semicircular receiving room entranceway on one end and a semicircular crypt or burial room opposite. On the exterior, four flights of balustraded stairs lead to a level terrace. The balustrade extends around the terrace to form a parapet, and there are several bronze statues, reliefs, and stone carvings located at the base of the obelisk. The obelisk rises 117 feet (36m) high.

William H. Mumler (1832–1884) was an American spirit photographer who worked in New York City and Boston. His first spirit photograph was apparently an accident—a self-portrait which, when developed, also revealed the "spirit" of his deceased cousin. Mumler then left his job as an engraver to pursue spirit photography full-time, taking advantage of the large number of people who had lost relatives in the American Civil War. His two most famous images are the photograph of Mary Todd Lincoln with the ghost of her husband Abraham Lincoln and the portrait of Master Herrod, a medium, with three spirit guides. Mumler was eventually taken to court and tried for fraud and larceny. Noted showman P. T. Barnum testified against him. He was later acquitted by a judge, and his photography career continued.

Mumler's photographs are recognized as fakes but they circulated widely during the last quarter of the 19th century and were marketed as objects of belief and visual curiosities both within and beyond the spiritualist movement. He later discovered a process, called the "Mumler Process", by which photo-electrotype plates could be produced and printed more easily.

Elizabeth Porter Todd Edwards (13 November 1813 – 22 February 1888) was the sister of Mary Todd Lincoln. She served as Mary's guardian for many years. Mary met Abraham Lincoln in 1839 at Elizabeth Edwards' home, where they later married. In 1875 Elizabeth helped Mary get released from an insane asylum.