I recently came upon this thread on Dick Bowles and found that he had been killed by members of the Seventh Kansas Cavalry.
Early this year I read the book Jennison's Jayhawkers by Stephen Z. Starr to learn about their duty in Southeast Missouri.
I went back to that book and found this report:
As late as the middle of June, a ten-man patrol of the Seventh, let by Sergeant Marion Cross of Company D, killed the "notorious" bushwhacker Dick Bowles and captured and brought back to camp five of his followers, who, Webster Moses opined, were going to "stretch Hemp."
Footnote: Webster Moses to his wife, June 10, and June 18, 1865, in Moses Letters. Cf, Official Records, XLVIII, Pt. 2, 937.