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Polk County, Florida -- Polk deputies are investigating a fatal crash that occurred early Sunday morning.

Just after 3 a.m. Renee Costanza was driving west bound with a passenger on Highway 60, in Mulberry. According to witnesses, Costanza was in the inside lane and Julie Melvin was seen standing in the lane.

Costanza applied the brakes locking the tires, but still struck Melvin. Costanza continued west on Highway 60 looking for a place to turn around and began to search for the victim. After searching for a short period of time without being able to locate the victim, emergency responders were contacted. Costanza then pulled over and waited for law enforcement to arrive.

Polk County Sheriff's Office deputies and Polk County Fire/EMS were already enroute to the scene as a result of another subject reporting the incident. Emergency responders attempted life saving measures, however, Melvin died at the scene.

Alcohol and speed are not believed to be a factor in this incident. The investigation is on-going.

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