CRESTVIEW — An out-of-town passenger suddenly died Tuesday afternoon, according to the Crestview Police Department.

The vehicle's driver called 911 at 3:28 p.m. to report her grandfather had a "medical event" while traveling on Interstate 10, according to the CPD. The vehicle pulled off I-10 and parked at the McDonald's on South Ferdon Boulevard to wait for emergency services' arrival. CPD officers arrived first, followed by the Crestview Fire Department and Okaloosa EMS. 

Emergency medical technicians performed CPR on the man, a CPD spokesperson said. However, Okaloosa EMS reported to CPD, the man "was dead on arrival at the scene."

The victim's information has not yet been added to police reports, but the CPD spokesperson stated they believe the man was "from Mississippi or Louisiana."

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This is a developing story. We will post updates as they become available.