I received your post from the Rootsweb (MUSKINGUM) list. Since you're familiar with them, have you tried subscribing to, and posting this on, the (KINCAID) rootsweb list?
I have forwarded your post to my cousin, a descendant of John Kinkead whom we lost, genealogically, in 1855. Our best info was that he died that day, Valentine's Day, at age 33. We don't know where he died or where he was buried. (Never thought to look in Coshocton, though.) But he left a wife and child in Jeffersonville, Fayette Co., OH, who subsequently remarried.
Do you have any dates for your John K., birth, death, or any?