A witness in Nashville to her husband's hanging.
Lived with her daughter, Ann Elizabeth Ferguson Metcalf and her family for decades. Martha never remarried, instead may have changed her surname from time to time. She and daughter and family lived in Kansas and then Oklahoma.
Martha passed away November 10, 1901 in Montgomery, Kansas. She was laid to rest in Oak Hill Cemetery, Elk City, Montgomery, Kansas, United States. 
↑ Find A Grave, database and images (https://www.findagrave.com : accessed 03 June 2019), memorial page for Martha Owen Ferguson (4 Mar 1826–10 Nov 1901), Find A Grave: Memorial #33046706, citing Oak Hill Cemetery, Elk City, Montgomery County, Kansas, USA ; Maintained by jimmy vincent (contributor 46982734) .
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6P1-BKB : 12 April 2016), Martha Ferguson in household of Champ Ferguson, Clinton county, Clinton, Kentucky, United States; citing family 328, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
"Kansas State Census, 1875," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QL66-KS8Q : 12 November 2017), M Furgerson in household of G T Metcalf, Montgomery, Geary, Kansas, United States; citing Census, Montgomery, Geary, Kansas, United States, 179, Kansas State Historical Society, Topeka; FHL microfilm 570,213.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMYH-4QR : accessed 3 June 2019), Martha Ferguson in household of George T Metcalf, Louisburg Township Elk town, Montgomery, Kansas, United States; citing enumeration district (ED) 141, sheet 20A, family 436, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,491.
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It may be possible to confirm family relationships with Martha by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Martha: