Police found five victims with gunshot wounds who were transported to a hospital, including a woman who was in critical condition and died at the hospital.
The wounded victims included a woman and three men, who all were listed in stable condition.
A sixth man travelled separately to a hospital with a gunshot wound from the shooting and was listed in critical condition, police said.
Investigators believe an altercation between two groups of people at the restaurant escalated to gunfire. It was not immediately clear if any of the victims fired shots, police said.
No arrests were immediately made after the shooting as police continued to investigate.
Two police officers remained at the scene Monday morning around 10 a.m. as members of the Indianapolis-Marion County forensic services agency crime scene unit entered the building. Law enforcement took down police tape that barricaded the restaurant’s parking lot around 10:30 a.m.