Wellington city councillor Malcolm Sparrow will be resigning from his role after a health scare.
In a letter to the council's mayor and chief executive, which he also sent the contents of to colleagues, Sparrow said his resignation would be effective from 5pm on Monday.
"I very much regret having to do so at this time but a recent health scare has driven me to make my health a top priority," Sparrow said.
"This term in office has been a challenging and disappointing one, and I have been weighing up my options for a considerable time.
"A medical event earlier this week confirmed for me that I needed to remove the stress from my life in the interest of my health. I am also concerned that I am no longer able to continue making as effective a contribution as I believe I made in my first two terms as councillor."