Isaac Heathcock later appears in the records of Sumter County, South Carolina where he purchased goods from the estate of Joseph Hathcock in 1817. His Will was written 24 May 1815 and probated 19 October 1817 (Book A, page 273) Greenville District, leaving his military warrants to his wife Mary. The Will states that he was a member of the Army. Another purchaser of the goods of the estate of Joseph Hathcock was one Mark Johnson who had been listed as a chain carrier in the survey of land for Thomas Hathcock in Anson, later Montgomery County, North Carolina.