Its existence is known not from direct inspection but from a sketch and accompanying notes recorded in the Ordnance Survey Letters, a remarkable nineteenth-century project in which antiquarians travelled Ireland documenting local history and monuments. The slab carries a Black Letter inscription around its margin, a style of lettering common on medieval and early modern funerary monuments, and the inscription itself presents its own small puzzle: one character, depicted in the sketch as a dotted or pocked line, may be the Roman numeral L, meaning fifty, or it may simply be decorative carving. That single ambiguity means the woman commemorated died either in 1529 or 1579, a gap of fifty years that nobody has been able to close.

The Latin text, as recorded in O'Flanagan's 1930 publication of the OS Letters, reads: here lies Renaldi, daughter of captain John Heffernan, wife of Richard Comyn, who died on the first day of March. The Heffernans were a Gaelic family with a long presence in Tipperary, and the title "captain" attached to John Heffernan suggests a man of local military or political standing. Renaldi, an unusual Latinised name, was presumably his daughter by birth and became connected through marriage to the Comyn family. The slab lies along the north wall of the church interior, near a second graveslab also bearing a Black Letter inscription. The north wall has partially collapsed, and the debris from that collapse, combined with generations of vegetation growth, has buried the interior so thoroughly that the stone could not be found during a recorded inspection.