An 18-wheeler struck and killed a Geismar woman who was trying to walk across Interstate 10 in Ascension Parish in the early morning hours Wednesday, State Police reported.

April D. Tasker, 21, parked her Acura RL sedan on the right shoulder of I-10 eastbound near La. 73 shortly before 3 a.m. Wednesday, troopers said in a news release.

Tasker was standing next to her car, when for unknown reasons she began to walk across the interstate to the median and she was struck by the tractor-trailer, which was traveling in the left-hand lane of I-10 eastbound, troopers said.

The Ascension Parish Coroner’s Office pronounced her dead at the scene.

Trooper Jared Sandifer, spokesman for State Police Troop A, said troopers do not know why Tasker stopped her vehicle on the side of the interstate.

He said the driver of the 18-wheeler, Wilhelm Salewski, 67, of Dayton, Texas, was not cited in the crash. Troopers do not suspect that Salewski was impaired by alcohol or drugs. He was wearing his seat belt and was not injured.

Sandifer said troopers do not know whether Tasker had alcohol or drugs in her system. Troopers took a blood sample from Tasker for analysis at the Louisiana State Police Crime Lab, troopers said.