Mesa city officials announced Monday that Police Chief Ramon Batista is leaving the department "to pursue personal interests and other professional opportunities."
Batista had been chief since July 2017.
The Mesa Police Association announced last June that 95 percent of its members comprised of civilian and sworn officers voted that they had no confidence in Batista.
The police department has been under scrutiny in recent years for a pair of videotaped encounters involving its officers.
The beating of a 33-year-old man captured on videotape and the rough treatment of a teenager prompted Batista to hire an outside attorney to investigate.
In a separate case in 2017, a former Mesa police officer was acquitted of a murder charge in the fatal shooting of an unarmed Texas man.