No. Never. Euthanasia or Mercy Killing is the proccess of putting a person suffering from untreatable diseases or severe diseases to death. It shouldn't be legalized. If the person is suffering from severe diseases, he should get treatment. If he is suffering from untreatable diseases, with his family's permission, he may or may not be put to death. I conclude that Mercy Killing facing denial from Family Members or Friends should be illegalized.