Louisiana State Police vehicles parked at headquarters, Wednesday, November 14, 2018 in Baton Rouge, La.

A 38-year-old Greensburg man was killed Sunday after he crossed into the oncoming lane and struck another vehicle head-on.

State Police say Ronald Lee Davis was driving a 2002 Buick LeSabre eastbound on La. Highway 16 in St. Helena Parish just after 3:30 a.m. when, for unknown reasons, he crossed into the westbound lane of traffic and collided with a 2002 Cadillac DeVille driven by John Ray Daniels, 35, of Denham Springs.

Davis was pronounced dead at the scene. His wife, Pamela Topps, 38, also of Greenburg, who was in the passenger seat sustained moderate injuries, State Police said.

Daniels sustained serious injuries, and both Topps and Daniels were transported to area hospitals for treatment, according to State Police.

None of the occupants in either vehicle was restrained at the time of the crash. Impairment is not suspected as a contributing factor, but blood samples were collected for analysis.