Education
He attended the common schools and high school in Galena, Ohio, National Normal School, Lebanon, Ohio, and Ohio Wesleyan University, Delaware, Ohio.
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He attended the common schools and high school in Galena, Ohio, National Normal School, Lebanon, Ohio, and Ohio Wesleyan University, Delaware, Ohio.
During the Civil War enlisted in the Forty-sixth Regiment, Ohio Volunteer Infantry, at the age of twelve. Mustered out for temporary disability and reenlisted in 1862 in the One Hundred and Twenty-first Regiment, Ohio Volunteer Infantry, and served until the close of the war. Prisoner of war in Salisbury, Danville, and Libby Prisons.
He moved to Paulding, Ohio, in 1872 and taught school.
He studied law. He was admitted to the bar in 1875 and practiced his profession in Paulding until 1891, when he engaged in agricultural pursuits. De Witt was elected as a Republican to the Fifty-fourth Congress (March 4, 1895 – March 3, 1897).
He was an unsuccessful candidate for reelection in 1896. He resumed agricultural pursuits near Paulding, Ohio.
He moved to Standish, Michigan, in 1903 and resumed the practice of law.
He served as register of deeds. De Witt was elected prosecuting attorney of Arenac County, Michigan, in 1926. He was reelected in 1928 and served until his death in Standish, Michigan, on March 21, 1929.
He was interred in Live Oak Cemetery, Paulding, Ohio.
He served as member of the State house of representatives 1892-1895. He served as member of the Michigan House of Representatives 1920-1922.