The paper deals with the consciousness of mortality as a means of assimilating the radical other (i.e. death) in human life. By introducing the ontological aspects, such as non-functionality, irreversibility, necessity, universality, potentiality and post-mortality, the death and mortality are interpreted with regard to the otherness. The otherness of death is either relative, or absolute. Attention is paid also to the death anxiety. In conclusion the question is asked, whether it is possible to speak meaningfully about death.