He was the father of legendary boxer Jack Dempsey.
He passed away in 1959.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/159822/hyrum-dempsey: accessed 16 December 2023), memorial page for Hyrum Dempsey (4 May 1856–22 Feb 1948), Find a Grave Memorial ID 159822, citing Mount Olivet Cemetery, Salt Lake City, Salt Lake County, Utah, USA; Maintained by Burt (contributor 46867609).
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DNA Connections
It may be possible to confirm family relationships with Hyrum 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 Hyrum:
Dempsey-744 and Dempsey-519 appear to represent the same person because: this is an obvious duplicate and should not have been set as an unmerged match. Same name, dates, and spouse
1879 Dec 19, Logan, by Peter N Dingess. Husband: Hiram Dempsey, single, born 1857 in & farmer in Logan, parents W A Dempsey & H Blair. Wife: Celia Smoot, single, born 1860 in & resides in Logan, parents C A Smoot & F B Greaver.
His marriage record names his parents and shows that they have the same wife.
Register of Marriages, p 38, ln 80. accessed 2016 Mar 7.