Elijah Threlkeld died before 1785 in Henry Co, as his wife Elizabeth was appointed admin of his estate (Henry Co Order Book #4) Oct 27, 1785.
She married Skelton Napier in 1789 Franklin Co, Va (she was inaccurately transcribed as Elizabeth Throsdall).
Thomas Threlkeld, father of (cannot rule out brother-doubt) Elijah was living in Snow Creek, Franklin Co, Va as of Sept 23, 1802, when he was named as a nearby resident in a deed whose grantor was Elizabeth Cook Threlkeld Napier's brother Benjamin Cook (Franklin Co deed book 4:380).
Hope this helps someone. Tom Goggin firstname.lastname@example.org