Update 9:40 p.m.:

With all nine precincts reporting, challenger John Keller has defeated one term incumbent Ernest Burguières for a seat on the Mandeville City Council, according to complete but unofficial results from the Secretary of State’s website.

Keller earned 567 votes to 375 for Burguières in the district, which encompasses the part of the city known as Old Mandeville.

Keller may be a newcomer to running for office, but he’s no political neophyte. His father was a councilman.

As expected, turnout in the race was far lower than in the March 5 presidential primary: with 942 votes, it’s almost 500 fewer votes.

The win will be the second big win for Mandeville Mayor Donald Villere, who in addition to winning his own seat in a hotly contested race, assisted Keller to defeat a persistent nemesis.

Original story:

Voters in Old Mandeville were the only voters in St. Tammany Parish who were able to vote for a candidate Saturday in the runoff for Mandeville City Council District III.

Incumbent Ernest Burguières and challenger John Keller are vying for the seat. The two finished just seven votes apart in the March 5 election. The third candidate, Jeff Lyons, collected more than a quarter of the vote.

The big question is turnout. In 2011, when Burguières won in a runoff, turnout dropped by nearly half in the runoff.

The two present a significant contrast in personality: the fiery Burguières has won both friends and enemies with his confrontational style; Keller is more reserved, and has said he would take a different tact than Ernest in relating to his colleagues on the council and especially Mayor Donald Villere, with whom Ernest has frequently clashed. Villere was reelected in March for another four year term.

Follow Faimon A. Roberts III on Twitter @faimon.