In this book, Douglas Walton examines the philosophical nature of two issues currently associated with medical ethics. In order to work towards an analysis of the concept of death that could function as a target towards which the medical criteria of death could be directed, he proposes the foundations for a theory free of logical contradictions, paradoxes, and other perplexities. This is the "superlimiting theory" which introduces the notion of a "possible person." The connection of these philosophical ideas with medico-legal concerns like brain death and the Harvard criteria is discussed....