The Ulster Unionist Party has expelled Strangford assembly member David McNarry.
A disciplinary committee to investigate complaints against Mr McNarry met on Monday.
The UUP said: "We followed due process and arrived democratically at our decision."
At the end of March Mr McNarry was suspended from the Ulster Unionists for nine months.
He resigned as the UUP Stormont whip in January after former party leader Tom Elliot demoted him from the deputy chair of the education committee.
The Strangford MLA also stepped down from the party's assembly group, but remained a party member.
His dispute with the former leader erupted after he gave an interview to a newspaper outlining discussions between the UUP and DUP about unionist unity.
After Mike Nesbitt replaced Mr Elliot as party leader in March, he said: "I cannot imagine any circumstances under which David McNarry would be back in the Ulster Unionist assembly group of MLAs when I have control of the whip."