Dallas City Manager Mary Suhm announced she will resign after preparing the next city budget.
Suhm, who has been city manager for the last eight years, has served in management positions with the city of Dallas for 35 years.
"As a newly elected and returning council led by an experienced mayor prepares to take its seats, I am giving notice that, following preparation of the upcoming budget, I will be leaving my position as city manager," she said in a memo to the City Council on Wednesday.
Suhm came under fire earlier this year over her handling of a natural gas well drilling lease on park land.
In a February confrontation, City Councilwoman Angela Hunt said Suhm had been "dishonest" in her communication about the lease.
But most council members strongly defended Suhm that day, and several of them tell NBC 5that Suhm's resignation has nothing to do with that controversy.
Councilman Tennell Atkins said Suhm simply decided it is a good time to retire from the city after so many years of service.
No replacement for Suhm was immediately announced.