Lindsey lives next door to James in the 1840 Sumter County, GA census. By 1840 census, Mary is living next door to James with her older son, James, and Alonzo. 1840 lists her as Mary E. King.
The marriage certificate is for "Linzey," and Mary Eliza Kirchfield: King, Linzey C Kirchfield, Mary Eliza 23 May 1837 [Book] 1 [Page] 40 Sumter County Index of Marriages Compiled by: William T Poupard P O Box 356 Leslie, GA 31764
Also http://sumtercountyhistory.com/marriage/MarrByHusb/Groom_K.htm
Will need to research deeds, etc., and still have not located death certificate, notice or grave site for "Linzey."
Presuming he died in Sumter County, GA.
Birth and death dates estimated between 1800-1810 and 1843-1849.
Alonzo may have been born in 1843.
"United States Census, 1840," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:33S7-9YBW-VG1?cc=1786457&wc=31S2-6YM%3A1588665920%2C1588667422%2C1588667419 : 24 August 2015), Georgia > Sumter > District 687 > image 21 of 68; citing NARA microfilm publication M704, (Washington D.C.: National Archives and Records Administration, n.d.).
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