UPDATED at 5:10 p.m. with ID of child.

ST. LOUIS COUNTY • A toddler was struck and killed on the parking lot of a medical office early this afternoon, authorities said.

The driver of the car that hit the child was a doctor who tried to resuscitate the 21-month-old girl, but she died at the scene, according to St. Louis County Police Lt. Gary Guinn.

The girl, identified as Kourtney Straughan, was among three children taken to Esse Health Tesson Ferry Pediatrics and Internal Medicine at 13303 Tesson Ferry Road by their mother and aunt about 12:40 p.m., Guinn said. The aunt got out with two older children and went to the entrance of the office while the mother got Kourtney out of the car.

She set Kourtney down on the ground for a moment, Guinn said, and the girl apparently saw her siblings and started running over to them across the parking lot. She was struck by the doctor, who was driving in the parking lot.

The doctor performed CPR, but Kourtney died, Guinn said.

Authorities said the family was from the Bonne Terre, Mo., area.

Guinn said it did not appear any criminal charges would be filed based on the preliminary investigation.