"Illinois Deaths and Stillbirths, 1916-1947," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NQM7-SVY : accessed 26 December 2015), Joseph Curtis Long in entry for William Curtis Long, 16 May 1934; Public Board of Health, Archives, Springfield; FHL microfilm 1,711,830.
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DNA Connections
It may be possible to confirm family relationships with William 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 William: