Mississippi doesn't publish death dates after 1943.
There isn't a genealogical society in Hinds County.
You can contact the Jackson Hinds Library System, www.jhlibrary.com/resources-for-jackson-hinds-library/
and ask if they'll look up Samuel's obit in Proquest. Hopefully Rose will be mentioned in it.
You can contact the Hinds County Chancery Court Clerk and ask for a copy of his probate records.