Bluford S. Cox was an outlaw who killed at least 26 men in his lifetime.
here is one
Deputy Sheriff, George M. Doolittle, Lampasas county Sheriff's department, Texas. end of watch Wednesday, January 8, 1879, he was in the area of Lexington, Indian Territory (Later Oklahoma), attempting to arrest Bluford Cox, who was from Lampasas county, Texas. who was wanted for the murder of Thomas Gardner of Williamson county, Texas. as Doolittle attempted to arrest Cox, Cox shot and killed the deputy, Cox escaped.
Doolittle was a former Texas Ranger and was single about 3\28-29 years old. 
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It may be possible to confirm family relationships with Bluford by comparing test results with other carriers of his ancestors' Y-chromosome or 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 DNA with Bluford: