BATON ROUGE - A man is dead after an unknown shooter opened fire on a car driving on I-12 over the weekend. 

The Baton Rouge Police Department said the shooting happened around 3 a.m. Saturday on the interstate between Airline Highway and Drusilla Lane while the car was headed westbound. It wasn't immediately clear where the gunfire came from.

Two victims showed up at a hospital, the driver and passenger in that vehicle. The driver was not seriously hurt, but police said the passenger, 28-year-old Toby Taylor, suffered "grave" injuries in the attack Saturday.

Late Sunday night, police said Taylor died in the hospital.

There is no clear motive or suspect at this time.