Short biography of Senator Lewis F. Linn from http://bioguide.congress.gov/scripts/biodisplay.pl?index=L000338:

LINN, Lewis Fields, 1796-1843
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Senate Years of Service: 1833-1837; 1837-1843
Party: Jacksonian; Democrat

LINN, Lewis Fields, (brother-in-law of James Hugh Relfe, half-brother of Henry Dodge, uncle of Augustus Caesar Dodge), a Senator from Missouri; born near Louisville, Ky., November 5, 1796; received a meager academic education; studied medicine in Louisville; served in the War of 1812 as a surgeon; completed his medical studies at Philadelphia, Pa., in 1816; was admitted to practice and located at Saint Genevieve, Territory of Missouri, where he played a significant role in combating two cholera epidemics; member, State senate 1827; appointed to the French Land Claims Commission in Missouri in 1832; appointed and subsequently elected as a Jacksonian to the United States Senate to fill the vacancy caused by the death of Alexander Buckner; reelected in 1836 and again in 1842 and served from October 25, 1833, until his death in Saint Genevieve, Mo., on October 3, 1843; chairman, Committee on Private Land Claims (Twenty-fourth through Twenty-sixth Congresses), Committee on Agriculture (Twenty-seventh Congress); interment in the Protestant Cemetery. [I am currently assuming this means Holy Cross Lutheran]

Bibliography
American National Biography; Dictionary of American Biography; Husband, Michael B. ‘Senator Lewis F. Linn and the Oregon Question.’ Missouri Historical Review 66 (October 1971): 1-19; Linn, Elizabeth and G.B. Sargent. Life and Public Services of Dr. Lewis F. Linn. New York: D. Appleton and Company, 1857.