Smith County courthouses burned 3 times. Once before 1892 (no one knows the date for certain). Once in 1892, and that was a total record loss, so there is nothing before 1892. The last fire was in 1912. There are intermittent records between 1892 and 1912.
There are no death records as such in MS until 1912.
Smith county does have wills, deeds, eitc., but finding things will be hit and miss with the 1912 fire.
The newspapers for that time are:
Smith County Reformer
I do research in this area occasionally and am familiar with the resources there if you need further help: www.SouthernHeritageGenealogy.com