Per his sister - Pearl (Rucker) Grubb - Lee died in the 1918 flu epidemic.
Sources
*"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2BP-L1G : accessed 3 March 2019), Lee Rucker in household of J M Rucker, Union, Pulaski, Missouri, United States; citing enumeration district (ED) ED 82, sheet 14B, family 313, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 806; FHL microfilm 1,374,819.
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DNA Connections
It may be possible to confirm family relationships with Lee by comparing test results with other carriers of his ancestors' Y-chromosome or 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 some percentage of DNA with Lee: