Tabor Vaux, who won the County Council District 9 seat in a special election last week, was sworn into office Monday morning.
Vaux won the seat in a Republican primary held Jan. 28. Because no other party fielded a candidate and no write-in or petition candidates came forward, he was named the seat winner Friday.
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The seat was vacated by former Chairman Weston Newton, who was elected to the S.C. House of Representatives in November.
Vaux, 29, is the youngest seated council member. He is a graduate of Hilton Head Island High School, The Citadel and the Charleston School of Law.
Judge Carmen Mullen administered the oath Monday morning; Vaux was accompanied by his wife, Erin.