Dick Yeager (or Yager) was severely wounded in the head as part of a raid by about 200 guerrillas led by George Todd against Arrow Rock, southeast Saline County, on 20 July 1864. Some of Todd's men took Yeager to near New Frankfort, northeast Saline County, and turned him over to the Ike Flannery family living there in exile from Jackson County because of General Order Number 11. Todd's band could not remain with Yeager since they were based in Lafayette County, and the wounded guerrilla could probably not be safely moved that far.
About two weeks later in early August Union troops found the wounded Yeager and killed him. Union authorities only determined the correct identity of they man they killed after a few days.
Sources for the above include:
--1881 Saline County history, pp. 306, 315-6;
--1910 Saline County history, p. 193;
--Barton, "Three Years With Quantrill" (memoir of guerrilla John McCorkle), p. 155;
--Burch, "Quantrell [sic]," (memoir of guerrilla Harrison Trow), p. 207;
--St. Louis newspaper "Daily Missouri Democrat" of both 26 Jul 1864 and 2 Aug 1864;
--"Official Records," series 1, vol. 41, part 1, pp. 51, 56; part 3, p. 72.
I hope that helps.