ST. LOUIS COUNTY, Mo. – We are learning new details about a deadly incident overnight where a woman was hit by a car and killed on I-55 in south county. Cpl. Dallas Thompson with the Missouri Highway Patrol confirmed that the incident overnight was a fatal hit-and-run.

It took place around midnight on I-55 southbound at Lindbergh. Thompson told FOX 2 that an adult female was hit on I-55 southbound and that the vehicle that hit her left the scene. At this hour, that vehicle has yet to be identified.

I-55 southbound at Lindbergh was shut down for a while overnight while authorities investigated what happened. Thompson added that the woman was taken to a hospital, where she was pronounced dead. At this point, Thompson said that the medical examiner is still trying to make a positive identification of the woman. So we still don’t know her name or exact age.

Thompson is also telling us it’s still unclear why she was on the highway in the first place.

The investigation is still ongoing Wednesday morning. FOX 2 will update this story with more information as it becomes available.