"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JGTL-8QM : 12 January 2021), Jack L Gaddy, 13 May 2010; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"United States, GenealogyBank Obituaries, Births, and Marriages 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKGT-ZG7M : accessed 10 October 2022), Jack L Gaddy, Oklahoma, United States, 15 May 2010; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Tulsa World, born-digital text.
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DNA Connections
It may be possible to confirm family relationships with Jack 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 some percentage of DNA with Jack: