Once Garfield died, the government officially charged Guiteau with murder. He was formally
indicted on October 14, 1881, on the charge of murder, upgraded from the previous charge of
attempted murder. Guiteau pleaded not guilty to the charge. He also sent Arthur a letter in which he argued that Arthur should set him free because by killing Garfield, he had elevated Arthur to the presidency and increased Arthur's salary from $8,000 to $50,000. The trial began in Washington, D.C., on November 17 in the Supreme Court for the District of Columbia (which became the
U.S. District Court for the District of Columbia). The presiding judge in the case was
Walter Smith Cox. Although Guiteau insisted on trying to represent himself during the entire trial, the court appointed Leigh Robinson to defend him. After less than a week of trial, Robinson retired from the case. George Scoville then became lead
defense counsel. While Scoville's legal experience lay in land title examination, he had married Guiteau's sister and felt obliged to defend him.
Wayne MacVeagh, the
U.S. Attorney General, served as the chief
prosecutor. MacVeagh named five lawyers to the prosecution team:
George Corkhill, Walter Davidge, retired judge
John K. Porter,
Elihu Root, and E. B. Smith. '', 1881 Guiteau's trial was one of the first high-profile cases in the United States where a defense based on a claim of
temporary insanity was considered. Guiteau vehemently insisted that while he had been legally insane at the time of the shooting (claiming God had taken away his
free will) he was not medically insane, which was one of the major causes of the rift between Guiteau and his defense lawyers. The judge gave the jury instructions based on the
M'Naghten test. The defense hired
Edward Charles Spitzka, a leading
alienist, as an
expert witness in support of an insanity defense. Spitzka had stated that it was clear "Guiteau is not only now insane, but that he was never anything else." While on the stand, Spitzka testified that he had "no doubt" that Guiteau was both insane and "a moral monstrosity". He came to the conclusion that Guiteau had "the insane manner" he had so often observed in asylums, adding that Guiteau was a "morbid
egotist" with "a tendency to misinterpret the real affairs of life". He thought the condition to be the result of "a congenital malformation of the brain". Corkhill, who was the
District of Columbia's
district attorney and on the prosecuting team, summed up the prosecution's opinion of Guiteau's insanity defense in a pre-trial press statement that also mirrored public opinion on the issue: '', showing Guiteau holding a gun and a note that says "An office or your life!" The caption for the cartoon reads "Model Office Seeker". Guiteau became something of a media sensation during his entire trial for his bizarre behavior, which included his cursing and insulting the judge, most of the witnesses, the prosecution, and even his defense team, as well as formatting his testimony in
epic poems which he recited at length, and soliciting legal advice from random spectators in the audience via passed notes. He dictated an autobiography to the
New York Herald, ending it with a personal ad for "a nice Christian lady under 30 years of age." He appeared oblivious to the American public's hatred of him, even after he was almost killed twice himself. He frequently smiled and waved at spectators and reporters in and out of the courtroom. At one point, Guiteau argued before Cox that Garfield was killed not by the bullets but by medical malpractice; "The doctors killed Garfield, I just shot him." Throughout the trial and up until his execution, Guiteau was housed at
St. Elizabeths Hospital in the southeastern quadrant of Washington, D.C. While in prison and awaiting execution, Guiteau wrote a defense of the assassination he had committed and an account of his own trial, which was published as
The Truth, and the Removal. , taken at the
D.C. Jail on February 6, 1882 To the end, Guiteau was making plans to start a lecture tour after his perceived imminent release and to run for president himself in 1884, while at the same time continuing to delight in the
media circus surrounding his trial. He was found guilty on January 25, 1882, and
sentenced to death. After the guilty verdict was read, Guiteau stepped forward, despite his lawyers' efforts to tell him to be quiet, and yelled at the jury, saying, "You are all low, consummate jackasses!", plus a further stream of curses and obscenities before he was taken away by guards to his cell to await execution. Guiteau
appealed, but his conviction was upheld. In the weeks before his execution, Guiteau composed a lengthy poem asserting that God had commanded him to kill Garfield to prevent Blaine's "scheming" to go to war with Chile and Peru during the
War of the Pacific. The
Evening Star printed this poem on June 7, but omitted two verses denigrating Arthur and the Supreme Court. Guiteau also claimed that Arthur knew the assassination had saved the United States, and that Arthur's refusal to
pardon him was the "basest ingratitude." His hands were tied. He tripped on the first step of the scaffold and stubbed his toe. On the scaffold, Hicks delivered a short prayer; then Guiteau read aloud from
Matthew 10:28–41 (Guiteau's hands being tied, Hicks held the Bible open for him); Finally, Guiteau "chant[ed], in a sad, doleful style," After he finished reading his poem, a black hood was placed over Guiteau's head. He shouted out "Glory!" three times, and may have also said, "I come! Ready! Go!" By prearrangement with Strong, Guiteau signaled that he was ready to die by dropping the paper, and the gallows trapdoor was sprung. After only one sign of
muscle contraction, Guiteau was cut down. Although the rope had broken his neck instantly with the fall, doctors found that Guiteau's heart and pulse were still detectable, but within approximately fifteen minutes, his heart and pulse slowed down and stopped. Guiteau's body was not returned to his family, as they were unable to afford a private funeral, but was instead
autopsied and buried in a corner of the jail yard. With tiny pieces of the hanging rope already being sold as souvenirs to a fascinated public, rumors immediately began to swirl that jail guards planned to dig up Guiteau's corpse to meet demands of this burgeoning new market. Fearing scandal, the decision was made to disinter the corpse. The body was sent to the
National Museum of Health and Medicine in
Maryland, which preserved Guiteau's brain, as well as his
spleen (which the autopsy discovered to have been enlarged), and bleached his skeleton. These were placed in storage by the museum. Parts of Guiteau's brain remain on display in a jar at the
Mütter Museum in
Philadelphia. ==Psychological assessment==