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Frances Kamm, PhD, Lucius Littauer Professor of Philosophy and Public Policy at the John F. Kennedy School of Government, Harvard University, in her essay "Physician-Assisted Suicide, Euthanasia, and Intending Death" published in the 1998 book Physician-Assisted Suicide: Expanding the Debate, explained:

“Euthanasia involves a death that is intended (not merely foreseen) in order to benefit the person who dies. It differs from physician-assisted suicide undertaken in the interest of the person who dies partly in that it involves a final act or omission by someone other than the patient (e.g., the doctor) in order to end the patient’s life…. In active euthanasia, the doctor introduces the cause of the patient’s death, e.g., a lethal injection…. Active physician-assisted suicide can involve, for example, the provision of means of death, like pills, that a patient may use. However, it might also involve giving the patient a stimulant to keep him awake so that he can shoot himself. That is, the active assistance need not involve giving a lethal substance.”

1998