I found widow Nancy (of Thomas Kelley) married John McCall in 1854 Lawrence County, Ohio. On the 1860 Census in Decatur Township, Lawrence County is John & Nancy McCall, and also her son from a previous marriage, Thomas Eachus, a Farm Hand. On the same page as Thomas Eachus is Cader Powel and family including wife Catherine, daughter of Thomas Kelly. So Thomas Kell(e)y must have died between 1850 and 1854. A search of the Probate records for Lawrence County revealed in 1853 John Kelley, son, being appointed administrator of the Estate of his father, because his widow (not named) had not administered his Estate after his death. Also named is Charles B Bickle (husband of Isabella Kelly) and Daniel? Dillon. So it looks like Thomas Kell(e)y died in 1853, and on FamilySearch there is a Thomas Kelly died Ohio in 1853, but no image. Best wishes, Paul.