Hello. I would suggest you post in Mississippi as they are very much into the Civil War.
If you can not find him, more than likely he died in prison and his body was buried with the rest of the worthless Confederates in a pit or something simialar.
Now please understand I say that with a grain of salt as I know for a fact I had several ancestors and their kin who died in Yankee prisons.
If he took one of those diseases like smallpox, he did not take long to die.
That was what killed my ggg grandfather Lt.Fielding Price of the 1st Arkansas under Dobbins. The Union men out on patrol picked him up in late November of 1864 and he was dead by the 1st of Feb 1865 leaving a widow and a houseful of children who struggled to just survive.
Wishing you the best in your search.
Linda