S.C. Department of Transportation Secretary Robert St. Onge resigned after he was arrested Friday morning for driving under the influence.
He was charged Friday by a S.C. Highway Patrol trooper, according to Lexington County court records.
St. Onge was charged for having a blood-alcohol at least twice the state standard of .08, the Lexington County Sheriffs office said.
He was released on his personal recognizance. No other details were available.
St. Onge, a retired Army general who was a commandant of cadets at West Point, was appointed by Gov. Nikki Haley in 2011.
His resignation letter, released by the governors office, said he was leaving due to personal reasons.
Haley appointed Christy Hall, the departments deputy secretary of finance and procurement, as the acting director.
The agency oversees 41,409 miles of state roads -- fourth most in the nation.
After he left West Point, St. Onge worked at the Pentagon and led the 24th Infantry Division at Fort Riley, Kan.