William died on 16 Dec 1862 in New York City, New York County, New York, United States aged 88. [1]
Sources
↑ 1.01.1 "New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:2WH9-FVF : 3 June 2020), William Knapp, 16 Dec 1862; citing Death, Manhattan, New York County, New York, United States, New York Municipal Archives, New York; FHL microfilm 447,565.
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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: