Louise Poirier, a veteran Gatineau councillor and chair of the STO, is resigning from her municipal post.
Poirier, who represents Or�e-du-Parc, served her notice during a private meeting with Gatineau Mayor Marc Bureau on Monday. She will officially leave office August 10.
Bureau issued a news release about Poirier's sudden departure on Monday, thanking the councillor for her service.
A spokesperson for Poirier told CTV Ottawa she will not publicly announce the reason for her resignation until Wednesday.
Poirier was elected to council in 1999.
A byelection to replace the councillor will be held next fall.