This paper questions the ontological integrity of Dasein as Heidegger specifies Being in Being and Time. It does so with reference to the real-life, real-time realities of Being-in-the-world and Being-toward-Death, thus with entering into the world in the first place and with ensuing developmental realities anchored essentially in bodily change and movement and with ensuing knowledge of the world and of death. Basic Husserlian insights validate answers to Dasein’s ontological deficiencies, raising questions as to Heidegger’s reading of Husserl texts, for example, of a hereness in relation to a thereness in Dasein’s use of “equipment,” hence of Dasein’s “zero point of orientation” with respect to the world. The question of whether Dasein can be a Being-toward-death without Being-a-Body discloses additional insights into Dasein’s ontological deficiencies by clarifying the nature of physical and lived bodies and by drawing on Husserl’s descriptive analyses of Leib, the lived body. The paper ends by detailing an epistemological irony with respect to Heidegger’s subjective account of Dasein’s knowledge of Being-toward-death.