It is just over two metres long, decorated in false relief, a technique in which the surrounding stone is cut away so that the design appears to rise from the surface rather than being carved into it. The central motif is an interlaced cross with a three-bar knop beneath its head and a small stepped base at the foot of the shaft. Around the border and continuing in vertical lines along one side of the slab runs an inscription in Black Letter script, the angular, densely stroked lettering common to late-medieval monuments and manuscripts.

The inscription records the burial of Edmund Butler, described as formerly Second Justice of the Chief Place of Queen Elizabeth I in Ireland, who died on the first of January 1585. His full name is given in the Latin text as Edmundus filius Thebaldi Butler, Edmund son of Theobald Butler, placing him within one of the most prominent Anglo-Norman dynasties in Munster and Leinster. The Latin was transcribed and translated by the historian Carrigan in 1905, who rendered the closing lines as a dedication from Edmund's wife: Rose Archer had the chapel and tomb erected after his death. That personal detail shifts the monument from a legal or dynastic record into something more quietly human. Rose Archer's initials, R and A, are interlaced at the lower part of the cross-head; Edmund's initials, E and B, appear at the upper part, though the E has spalled away and the B is now missing. The slab's sides carry an ovolo moulding, a convex rounded profile common in late-sixteenth-century funerary stonework, which suggests the slab was designed as part of a more complete tomb structure, of which this stone floor element is now the main survivor.