On January 11, 2016, DeVillier succeeded term-limited Democratic Representative Mickey Guillory.
In the October 24, 2015 primary election, DeVillier led a three-candidate field with 6,308 votes (55.8 percent).
He defeated another Republican, former Representative Gregory L. Fruge, who polled 3,036 votes (26.9 percent), and Democrat Germaine Simpson, who finished with 1,956 votes (17.3 percent).
He owns DeVillier House Movers in St. Landry Parish.
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