Stewart said Thursday that he will resign from the council after the first of the year. That's when he and his wife, Joanna, expect to gets a call to serve an LDS Church mission.
Stewart, a former mayor, said he and his wife decided to answer the church's call for more couple missionaries.
"We're not getting any younger," said Stewart, 68, "and we accomplished what we wanted on the council."
Stewart has been a vocal critic of the city's iProvo fiber-optic network and the subsidies the city has paid into it, prompting speculation that he was planning to run for mayor against Billings. Stewart was elected mayor in 1993 and served one term.
Provo sold the iProvo system to Broadweave Networks, a move Stewart said was good for both the city and subscribers.
Stewart and his wife previously served an LDS mission to the Navajo reservation, and he later presided over the Argentina Neuquen Mission.
