In 1870 census of Cocke County, Nancy C. McGaha appears. Because she was the same age as Catherine (Tittle) McGaha, widow of William H. McGaha, a researcher assumed this was Catherine. Actually Catherine is there too; the page is just so faded it's hard to tell she's there. Nancy C. had Tritts and Allisons living wither her. She is the widow of Bartlett Tritt and Joshua Allison of Haywood Co, NC. The researcher who equated Nancy and Catherine shared that mistake; there are now lots of family trees out there tainted with this mistake.
I just ran across the estate papers of Joshua Allison. One page names Nancy C. McGahey and husband Robert McGaha. So Nancy C. was the third wife of Robert McGaha. The paper is dated 1864.
If you have the wife of William H. McGaha in your tree as Nancy Catherine Tittle, please correct it to just Catherine Tittle.