Doris Salcedo’s work calls towards the conjuring of absent testimony and silent witnesses. Across a broad range of works, Salcedo evokes the unwitnessed deaths of thousands of ‘missing’ Columbian peoples who disappeared in the early 21st century. This paper explores how the work of Maurice Blanchot – in particular The Instant of My Death (1994) – can help us understand the deconstruction of witnessing and testimony in Salcedo’s works Plegaria Muda (2008-10) and A Flor de Piel (2012). In both works Salcedo evokes the silent witness, a spectre (Derrida, 1996) that calls forth a responsibility to mourn the missing. This paper considers how Salcedo’s conjuring of silence locates testimony as a work in continual opposition to both truth and fiction, and in so doing proposes a new location of witnessing that demands a new approach to testimony.