Euthanasia, sometimes called “mercy killing,” can be a difficult issue. On one hand, we do not want to take a person’s life into our own hands and end it prematurely. On the other hand, we do not want to prolong the process of dying more than necessary—that is, we want to preserve life, but not prolong death. At what point do we simply allow a person to die and take no further action to extend his or her life?