He left the Yukon Party caucus on April 28, 2004 to sit as an Independent after being criminally charged with the indecent assault of two teenage girls in the 1970s.
The Official Opposition sought, but failed, to earn unanimous consent of the Legislative Assembly to call upon Arntzen to resign.
The media also called upon Arnzten to resign - or for Fentie to support his expulsion from the Assembly.
Despite Arntzen's resignation, the Yukon Party retained its majority status in the legislature.
However, before it could proceed, the Crown stayed the charges, citing a loss of reliable evidence in the case over time.