Sheriff Greg Munks announced last Friday that he will retire July 16 due to the effect a "not life-threatening" heart condition is having on his quality of life and ability to work full time.
Mr. Munks, 61, who has two years remaining in his third term as sheriff, is on medical leave, and Undersheriff Carlos Bolanos has been serving as acting sheriff.
The Board of Supervisors will determine what to do about the rest of Mr. Munks' term, according to the announcement.
Mr. Munks was elected in 2006 after serving as undersheriff for then sheriff Don Horsley, now a supervisor. Mr. Munks has been re-elected twice.
"It has been an honor and privilege to lead the outstanding men and women of the Sheriff's Office for the past nine and a half years," he said in the statement. "I have tremendous respect for the work they do every day to keep our community safe."
Mr. Bolanos has announced his interest in succeeding Mr. Munks, a candidacy that Mr. Munks said he supports.