Tim,
I read his service records. There is nothing to indicate he was wounded or if he died of disease. I think I saw one that read Absent, at hospital.
Do you know where he may have died?
I checked the Unit cards in Fold3 and it shows the regiment was at these locations:
July to Sept : Satillo MS
Aug 30 to Oct 30: Camp Rogers, near Waterford, MS (just south of Holly Springs)

If he entered a hospital, it might have been at Holly Springs. There were a lot of soldiers who died before Vicksburg that are buried at Vaiden. That is easy access off I-55.
Something to look into.

Steve