Involuntary euthanasia, typically regarded as a type of murder, occurs when euthanasia is performed on a person who would be able to provide informed consent, but does not, either because they do not want to die, or because they were not asked.
Gas chamber in Hadamar Killing Facility
Euthanasia is the practice of intentionally ending life to eliminate pain and suffering.
The Death of Socrates, by Jacques-Louis David (1787), depicting Socrates preparing to drink hemlock, following his conviction for corrupting the youth of Athens
Felix Adler, c. 1913, the first prominent American to argue for permitting suicide in cases of chronic illness
Hartheim Euthanasia Centre, where over 18,000 people were killed