He passed away in 1874. He is buried with his family at the Scottish Cemetery in Caledonia, Illinois. 
↑ United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M854-T6C : 12 April 2016), James Montgomery, Guilford, Winnebago, Illinois, United States; citing family 150, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
↑ "Scotland Marriages, 1561-1910," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XTKJ-CJP : 10 February 2018), James Montgomery and Jean Caldwell, 03 Mar 1826; citing Southend,Argyll,Scotland, index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 1,041,076.
↑ Year: 1842; Arrival: New York, New York; Microfilm Serial: M237, 1820-1897; Microfilm Roll: Roll 049; Line: 9; List Number: 604
It may be possible to confirm family relationships with James by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with James: