His Records end at December. I have only done Company H/9 in detail. After I get to the whole regiment, I may be able to make some guesses. At this time I am working on the 27th and may not get to the 9th for months.
With his record of being present with no sickness until December, It is likely that he was killed in battle, rather than by sickness, if he died.
Stephen Kirk's Book on the 9th, George Grisom's Diary are good sources of the 9th in battle. In 1863 the 9th was in the Battle of Thompson Station, TN. Demonstrated at Nashville and Franklin, and then went back to Mississippi, to skirmish along the Black an Yazoo rivers. In 1864 The 9th was in the Atlanta Campaign, fighting over 110 days, with stops for food and rest, and both were scarce. The 4 regiments of the Ross Texas Cavalry Brigade traded spots in the line. They were in almost every battle of the campaign. Thy were part of the Cavalry that deterred the raids of Generals McCook and Kilpatrick. Both raids ended early and were forced back to union lines.
After Atlanta, the Brigade led the Hood Army into Tennessee, Provided recon and security for the Army and were part of the covering force in the retreat. General Forrest had kept the Cavalry out of the two major battles of the Tennessee Campaign. In December they were back in Mississippi and were paroled there in May 1865.
Let me know if I can help further.