Thach Nguyen, 30, was killed Thursday when he was hit by a vehicle while walking in the 9100 block of South Choctaw Drive, a Baton Rouge police spokesman said.

The incident occurred at 12:20 a.m., Sgt. Don Stone said.

When police arrived on scene, they found Nguyen lying in the road, Stone said.

Investigators determined he had been hit by a 1993 Geo Prism driven by John Moore, 53, of Baton Rouge, Stone said.

Moore was not injured and was questioned and released at the scene, Stone said.

Nguyen was taken to a local hospital where he later died, Stone said.

Investigators are still trying to determine how and why the collision occurred.