(NBC NEWS) Vermont is poised to become the fourth state to allow doctors to help terminally ill patients die.

A bill approved Monday night by the state House would allow doctors to prescribe lethal doses of medication. The Senate has already approved the bill. It goes to Gov. Peter Shumlin, a strong supporter.

Vermont would join Oregon, Washington and Montana. Oregon and Washington passed similar laws by popular vote, and a court order Montana made it legal there. Vermont would be the first to pass such a law through its legislature.

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