FERGUSON, Mo. — A Ferguson, Missouri, police officer fired the fatal shot that killed at man at a gas station in the St. Louis suburb, police said Wednesday.

The shooting happened just before 1:30 a.m. Tuesday at a convenience store. Police said 26-year-old Detarius Haynes and 18-year-old Joshua Campbell were in a vehicle that pulled up to a gas pump. St. Louis County police said in a news release that Campbell shot Haynes, who collapsed and died near the gas pump. It wasn't immediately clear what prompted that shooting.

A Ferguson officer who was walking out of the store shot Campbell. He ran onto West Florissant Road, where he collapsed and died, St. Louis County police said.

The 37-year-old officer was unhurt.

On the latest episode of "Sarra Sounds Off," Gregg talks with Michael Sicoli and Tess Ferguson about county champs crowned in boys and girls lacrosse, and Jared Valuzzi reports on the Long Island flag football championship. Credit: Newsday

Sarra Sounds Off Ep 36: Champs crowned in lax and flag football On the latest episode of "Sarra Sounds Off," Gregg talks with Michael Sicoli and Tess Ferguson about county champs crowned in boys and girls lacrosse, and Jared Valuzzi reports on the Long Island flag football championship.

On the latest episode of "Sarra Sounds Off," Gregg talks with Michael Sicoli and Tess Ferguson about county champs crowned in boys and girls lacrosse, and Jared Valuzzi reports on the Long Island flag football championship. Credit: Newsday

Sarra Sounds Off Ep 36: Champs crowned in lax and flag football On the latest episode of "Sarra Sounds Off," Gregg talks with Michael Sicoli and Tess Ferguson about county champs crowned in boys and girls lacrosse, and Jared Valuzzi reports on the Long Island flag football championship.

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