Amanda Sefton, if you're out there: I ran across a record that shows Lieut. Colonel J. T. Cearnal "Assigned to duty as Provost Marshal at Centre Point, Ark. G.O.? [can't read] 12. District of Ark. - Magruder."
I think this is the latest record I've seen of him. Apparently there is an extensive obituary of his widow Mary in the Dade County (Mo.) Advocate in late October 1914 (following a shorter notice of her death the week before), but I don't have access to that paper. Do you have a copy?