The Nauvoo Expositor was a newspaper in Nauvoo, Illinois, that published only one issue, on June 7, 1844. Its publication set off a chain of events that led to the death of Latter Day Saint prophet Joseph Smith.
The Expositor was founded by several seceders from the Church of Jesus Christ of Latter Day Saints and some non-Mormons in the Nauvoo area. The single edition of the newspaper was critical of Smith and other church leaders. Specifically, Smith was criticized for teaching doctrines such as plural marriage and exaltation.
In response to the newspaper's publication, Smith and the Nauvoo City Council declared the paper a public nuisance, and ordered the press destroyed. The town marshal carried out the order during the evening of June 10.
The destruction of the press led to charges of riot against Smith and other members of the Council. After Smith surrendered on the charges, he was also charged with treason against Illinois. Smith was killed by a mob while awaiting a trial in Carthage Jail.
A group of former members of the church were in open conflict with Smith for various doctrinal, economic, and political reasons.
Although he publicly denied being involved in polygamy, it was known within the church that Smith was married to multiple women. In 1842, former church leader John C. Bennett made public allegations of Smith's unorthodox marriages. On August 12, 1843, Hyrum Smith read Smith's revelation concerning plural marriage to the Nauvoo High Council.