I can narrow down a death timeframe for Lewis W. Flemister. Unfortunately, I can't narrow down a place except to say it was in Alabama.
According to a Jasper County court record in 1846, Lewis was already in AL. They were in Floyd County, GA for the 1850 census.
My 3rd great-grandfather Jeremiah Gilstrap executed the estate of Ellender (Chism) Flemister in Jasper County from 1855-1857ish. He was sued by someone wanting Lewis's portion of the estate. Lewis was deceased in AL, and had left Jasper county bankrupt. Jeremiah Gilstrap said he wasn't paying the one creditor out of Lewis's portion because other creditors were owed first.
So the last child I have for Lewis was born in 1853, and he was dead before 1856. Hope that helps some.