Josiah Lamborn (January 31, 1809 – March 31, 1847) was the Attorney General of Illinois from 1840 to 1843 and was the chief prosecuting attorney in the trial of five defendants accused of murdering Latter Day Saint leaders Joseph Smith Jr. and Hyrum Smith.
[1] In the early 1830s, he moved to Jacksonville, Morgan County, Illinois, where he became involved as a leader of the anti-Jacksonian wing of the Democratic Party.
Early in his career, the Illinois Supreme Court found his professional conduct to be "highly censurable", but chose not to disbar or otherwise discipline him.
[1] Lamborn failed to win the endorsement of the Democratic Party for reelection and his term ended in January 1843, when he was succeeded by James A. McDougall.
[3] After his failure to gain re-election as Attorney General, Lamborn had begun to drink heavily.