Here is some info I have gleaned since my last posting.John Miller Kavanaugh eventually went back to Kentucky and lived with relatives.Many of them were living around Paint Lick.The Miller book, published in nearby Richmond, has a small picture of him as an old man on page 618.I found him in the 1860 census living with A Kavanaugh in Garrard County, Lancaster P.O.(Paint Lick is in Garrard County.)JMK's mother (Elizabeth Miller Kennedy -- remarried Thomas Kennedy) and several other relatives are buried in the Paint Lick cemetery.I don't have a list of everyone who is buried there, but I wouldn't be surprised if he were buried there also.
JMK's wife:On her tombstone it says: Sacred to the memory of Semiramiss S. Kavanaugh Daughter of Rev. William and Mary Woods Died Sept 16, 1841 Age 36 y. (notice that it doesn't even mention her husband by name) From other sources I have the date of her birth as Sept 1 1805 and the date and location of their marriage:12-10-1822, Franklin County TN.
Does your friend have a copy of the Miller book?It has tons of info on the Kavanaughs.It is available in several libraries in Kentucky.Full title:History and Genealogies of the families of Miller, Woods, Harris, Wallace, Maupin, Oldham, Kavanaugh, and Brown by W. H. Miller, Richmond, KY. 1907.