What would Kant’s categorical imperative and Aquinas’s natural law theory say about euthanasia and physician assisted suicide?

Choose only one of the ethical problems among

(Euthanasia & Physicial Assisted Suicide, Abortion, Sexual Morality, Legal Punishment, Environmental Ethics, Animal Rights) and give a detailed account of how any of the ethical theories mentioned in the book and first half of the course (Relativism, Egoism, Utilitarianism, Kant’s theory, Natural Law, Virtue Ethics, Ethics of Care) apply to the selected problem. For example,

What would Kant’s categorical imperative and Aquinas’s natural law theory say about euthanasia and physician assisted suicide?