Death has been an everlasting human question. It has been regarded as one of the existential and human epistemic concerns both in religions and various philosophical and theological schools. The question of death in the works of Saint Augustine has been largely dismissed by scholars. Scrutinizing his oeuvre indicates that compared to his predecessors and based on his approach to Christianity, specifically to St. Paul’s doctrines, Augustine is more attentive to the relation between death and sin. In his works, he justifies death based on the original sin as well as those everyday sins that committed by human being throughout her life, identifying sin as the cause of death. Accordingly, he prefers moral causes rather than natural causes resulting in death. Augustine contends that there are three types of death, i.e. corporeal death (the separation of soul and body), spiritual death (separation of human being and God due to sin), and the eternal death (in which soul remains in body, bearing the burden of eternal corporeal punishment away from God.) He believes that God created a human being in a way according to which she would have benefited from eternal life if she had not sinned. However, now not only corporeal death but also the eternal death of soul are the consequences of sins. He opines that all human race, Except Jesus and his mother are the heirs of the original sin committed by Adam and Eve. In this way, every human being is born sinful, contaminated by the original. According to this viewpoint, the human race cannot be perceived as naturally innocent or away from intellectual mistake and deviation. Rather, human being and her thoughts and deeds can be understood only based on the doctrine of fall. In addition, the Adam’s original sin in not merely an event but it is a complicated circumstance imposed by God as a punishment of Adam and Eve due to their disobedience which is followed by different types of death as well as such consequences as the supremacy of body over soul, suffering from old age and senility, struggling with carnal soul, and suffering from various pains, calamities, and illnesses. Critique: Augustine believes that the human race shares the original sin with Adam since they have been in his semen except they are saved by divine grace, becoming able to do the good. Divine grace, however, is not granted to all. Even human’s eligibility is not considered, even though it is not fair. Such figures as Pelagius criticize his extremist approach regarding the original sin, proposing salvation by eligibility. Accordingly, sin cannot be considered as inherited. Rather, everybody, including Adam, will be responsible for his deed. Thus, there is no Original Sin or Fall, but it is only the culprit who bears punishment. Plus, neither paradise nor hell is predestined, but a human being will be the master of his destiny. In addition, death is regarded as a natural phenomenon rather than punishment. Adam was mortal, with or without committing sin, and he was individually responsible for his deeds.