That missing section belonged to St Matthias, and once identified, it was reinstated to the tomb, reuniting a saint that had been split across two sites for an unknown length of time. The tomb itself has had an unsettled existence in other ways too. What survives is reassembled from two side panels of an altar tomb, a type of chest-shaped funerary monument typically decorated with saints, angels, or weepers along its flanks. The panels are now built up against the east and south walls of the north side chapel of the north transept of the cathedral on the Rock of Cashel, having previously stood as the northernmost reconstituted free-standing tomb in the transept itself.

The figures, carved within ogee-headed niches, each arch ending in a flowing pointed curve with decorated spandrels in the angles, represent a near-complete apostolic procession. Along the east wall, reading from north to south, stand St Thaddeus carrying a cross-staff and book, the restored St Matthias, an unnamed bishop with his crozier turned outward and his right hand raised in blessing, St Matthew holding a scimitar-like blade turned downward though his head and niche have not survived, St Peter with his two keys, and St Andrew with his distinctive saltire cross. The south wall continues with a partly lost figure, St Philip bearing loaves in a napkin, St James Major shown as a pilgrim complete with hat, staff, book, and a purse bearing a scallop shell, and St John holding a chalice. The scholar John Hunt, writing in 1974, attributed these figures to the O'Tunney workshop, a family of stone carvers active in late medieval Tipperary whose output can be found across a number of ecclesiastical sites in the region. The workshop's style is characterised by a certain formal stillness in the figures, each saint given just enough detail in attribute and drapery to be identified rather than individualised.