MANDEVILLE - Police say a man from West Baton Rouge Parish died after his vehicle ran off I-12 and struck a tractor parked along the roadway.

According to state police, 39-year-old Gary Mercer Jr. was killed in the accident on I-12, just east of LA 59 in St. Tammany Parish.

Investigators say Mercer was driving his 2017 Ford Mustang eastbound when it ran onto a patch of grass and hit the John Deere tractor parked just outside the treeline. It's still unclear why Mercer's vehicle went offroad.

The crash remains under investigation.