Judge Theodoric McDearmon was born June 14, 1840 in St. Charles County and died May 17, 1911. He was a son of James Robertson McDearmon (1805 - 1848)who was Missouri State Auditor and a potential candidate for governor of Missouri at the time of his death. Theodoric studied at the College of St. Charles and then read law. He lived in Idaho (present-day Montana) from 1863-1866. Then he returned to St. Charles to practice law. In 1870 he was appointed city attorney. In 1884 he ran unsuccessfully for Judge of the Court of Appeals in St. Louis. He served as president of the Board of Curators of St. Charles Military College and Secretary of the City Public School Board.
In 1876 Theodoric married Fannie Fielding (1857-1930). They had five children: Madge (Mrs. Albert Granberry Reed), Miss Theo McDearmon (a respected school teacher and principal), Patty (Mrs. Thomas Knobel), Fielding McDearmon and Francis (Mrs. Fantley L. Gray). Theodoric died in 1911 and is buried in Oak Grove Cemetery in St. Charles.
Minnehaha McDearmon (the daughter of Theodoric's oldest brother John K. McDearmon) married George Sibley Johns.
- "The Journal of William Houston Gallaher." Western Historical Manuscripts Collection of the Ellis Library of the University of Missouri, Columbia. In 1865, William H. Gallaher traveled from St. Charles to Montana where he staked out a claim to mine gold. He mentions "The" McDearmon (Theodoric) was already living in Montana at that time.
- History of St. Charles, Montgomery and Warren Counties Missouri. St. Louis.: National Historical Company, 1885, pages 400-402.
- "Funeral of Hon. T.H. M'Dearmon," St. Charles Daily Cosmos, May 18, 1911. No. 117.