LONDON (AP) — Lawmakers in the Scottish Parliament will vote Tuesday on whether to make Scotland the first part of the United Kingdom to allow terminally ill adults to end their lives.

Members of the Edinburgh-based legislature have been given a free vote on the assisted dying bill, meaning they can decide according to their consciences, rather than along party lines. That makes it hard to predict the outcome of the decision, expected after 2200GMT.

Scotland is part of the U.K. — alongside England, Wales and Northern Ireland — and has a semi-autonomous government that has authority over many areas of policy, including health.

If the bill became law, people in Scotland with six months or less to live would be able to seek help to end their life. Two doctors would have to confirm the person was terminally ill and had the mental capacity to make the request.