Samuel Arnold, a conspirator in the failed Lincoln kidnapping attempt.  In 1864, John Wilkes Booth devised a scheme to kidnap Abraham Lincoln in Washington.  Booth persuaded Arnold to join the plot which was to be carried out on 17th March, 1865 when Lincoln was to attend a play.  The plot was abandoned, however, when Lincoln canceled his plans.  

Arnold appeared to lose interest in the plan to capture Lincoln and on 27th March, 1865, Arnold wrote a letter advising John Wilkes Booth to abandon his plans.  On 17th April, 1865 Arnold was arrested by the police.  He confessed to his role in the plan to kidnap Lincoln but denied any involvement in the murder.  On 29th June, Arnold was found guilty of conspiracy to murder the president and was sentenced to life imprisonment.  He was paroled in 1869 and died in 1906.

Description Source -  Library of Congress (for identity)

Year -  1865