The Green Party has rejected Kennedy Graham's request to be admitted back into the party fold and be on the party list for next month's general election.
Mr Graham and David Clendon earlier this week resigned at short notice from the party's 14-member caucus over co-leader Metiria Turei's admission she committed benefit fraud during the 1990s.
Ms Turei later quit as co-leader, which potentially opened the way for Mr Graham to return.
In a statement on Saturday morning, the party said it had declined his request to be a list candidate for next month's election.