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I would start searching US Disciplinary Barracks (USDB) records, or possibly Provost Marshal records of Fort Leavenworth.
Hope this helps
Dear Mr. Dietrich,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Inmate Case Files, 7/3/1895 - 11/5/1957 in the Records of the Bureau of Prisons (Record Group 129) but were unable to locate any records for Ross Dietrick or Ross E. Dietrick. However, we located 3 file units & 2 items in this series for “John Ross.”
We hope this is helpful. Best of luck with your family research!