The author examines the differences between killing and letting die according to the idea that killing is objectionable because it involves doing harm while letting die is objectionable because it involves failing to provide a benefit. He argues that the prima facie objection to letting die differs from the prima facie objection to killing by not arising from causal or explanatory relations between the agent and the victim’s death. Through a series of examples, the author attempts to show why killing and letting die are prima facie objectionable.