What did The 1990 Supreme Court decision in Cruzan v. Director of Missouri Dept of Health established?

The 1990 Supreme Court decision in Cruzan v. Director of Missouri Dept of Health established that individuals have the constitutional right to refuse medical treatment, including life-sustaining care, under the Due Process Clause of the Fourteenth Amendment. The case involved Nancy Cruzan, who was in a persistent vegetative state, and the Court ruled that states could require clear and convincing evidence of a patient's wishes before allowing the withdrawal of life support. This decision emphasized the importance of informed consent and the right to die, while also allowing states to set standards for the evidentiary requirements in such cases.