Investigators say a passer-by found 53-year-old Stanleigh Turner Duell unconscious and bleeding in the Amvets parking lot in destine around 7 o'clock Wednesday morning.
Duell was later pronounced dead at Fort Walton Beach Mmedical Center.
Investigators are interviewing witnesses.
They say Duell had been involved in an altercation outside the Amvets Tuesday evening, but was later back inside the establishment for several hours.
Anyone with information is asked to contact the Okaloosa County Criminal Investigations division at 850-609-2000 or emerald coast crime stoppers at 850-863-TIPS.