John van Dongen resigned from the B.C. Conservative Party after members voted against a leadership review at the party's annual general meeting on Saturday.
Van Dongen, the party's only sitting MLA, says he can't continue in the party while it's led by John Cummins.
"I want to emphasize I came to the party in good faith," he told reporters.
"But I cannot carry on with a leader who probably really doesn’t care whether I stay or go, and so I’ve got to do what I believe is right for my constituents and what I believe is right for British Columbians."
Van Dongen, who bolted from the governing Liberals to the Conservatives, says he will sit as an Independent in the legislature.
Hours earlier, party members voted 70 per cent against holding a leadership review.
A group of party members led by vice-president Ben Besler had been seeking to oust Cummins as party leader.
The group, which calls itself Friends of B.C. Conservative Party, is running a seven-member slate for the party's executive positions.
The most recent poll by Angus Reid put the Conservatives in third place with 19 per cent voter support, behind the governing Liberals at 25 per cent and the opposition NDP at 46 per cent.
Also on HuffPost:
Liberal MLA for Vancouver Point Grey, 15 years $98,175 per year to start $1.7 million lifetime
Liberal MLA for Penticton, 17 years $90,992 per year to start $1.57 million lifetime
Liberal MLA for Saanich North and the Islands, 17 years $89,000 per year to start $1.54 million lifetime
Liberal MLA for Shuswap, 17 years $89,084 per year to start $1.54 million lifetime
Liberal MLA for Kamloops-South Thompson, 17 years $87,700 per year to start $1.5 million lifetime
Liberal MLA for Chilliwack-Hope, 15 years $78,500 per year to start $1.35 million lifetime
Liberal MLA for Surrey-Cloverdale, 12 years $62,893 per year to start $1.09 million lifetime
Liberal MLA for Burnaby-Lougheed, 12 years $49,000 per year to start $720,000 lifetime (13 years until he turns 80)
Liberal MLA for Chilliwack, 12 years $48,289 per year to start $835,000 lifetime
Liberal MLA for Surrey-Tynehead, 12 years $47,600 per year to start $824,000 lifetime
Liberal MLA for Vancouver False Creek, 4 years Ineligible for MLA pension, less than six years of service
Liberal MLA for Port Moody-Coquitlam, 6 years $30,000 per year to start $520,000 lifetime
NDP MLA for Pitt Meadows-Maple Ridge. 8 years $28,500 per year to start $490,000 lifetime
Liberal MLA for Vancouver Fraserview, 4 years Ineligible for MLA pension, less than six years of service