It happened on I-26 eastbound at exit 107 around 3:56 am.
According to the coronerâ??s office, 31-year-old Miranda Senn of West Columbia was driving a moped when she was struck by an unknown vehicle which left the scene.
Senn was pronounced dead at the scene.
The accident remains under investigation by the Lexington County Coronerâ??s Office and the South Carolina Highway Patrol.