Here is a story in the National Right to Life News about assisted suicide in Montana. Assisted suicide is technically prohibited in Montana but a decision by the Montana Supreme Court in 2009 held that a doctor who assisted in the death of a terminally ill, mentally competent patient would be immune from a homicide prosecution; the Court did not reach the broader state constitutional issue of whether there was a constitutional right to die with dignity.
The Montana legislature tried to change this by explicitly prohibiting assisted suicide. It appeared that the measure was going to pass but a legislator changed her vote and opposed the measure. Apparently she had intended to vote in favor of the ban on assisted suicide. Her mistake in voting prevented the passage of the law.