Canada's highest court unanimously struck down a ban on doctor-assisted suicide for mentally competent patients with terminal illnesses, declaring on Friday that "an individual's response to a grievous and irremediable medical condition is a matter critical to their dignity and autonomy."

The Supreme Court's decision reverses its own decision two decades ago and gives Parliament a year to draft new legislation that recognizes the right of consenting adults who are enduring intolerable suffering to seek medical help ending their lives. The current ban on doctor-assisted suicide stands until then.

The judgment said the ban infringes on the life, liberty and security of individuals under Canada's constitution. It had been illegal in Canada to counsel, aid or abet a suicide, an offense carrying a maximum prison sentence of 14 years

"The law allows people in this situation to request palliative sedation, refuse artificial nutrition and hydration, or request the removal of life-sustaining medical equipment, but denies the right to request a physician's assistance in dying," the ruling noted.