Story highlights The troopers responded to a stranded motorist call outside Tulsa

An altercation broke out and they fired, killing one of the two men at the scene

(CNN) Highway patrol troopers in Oklahoma fatally shot a man whom they had been trying to get out of high water, authorities said.

The two troopers responded to a stranded motorist call south of Tulsa late Friday and found two men with two vehicles, said Capt. Paul Timmons of the Oklahoma Highway Patrol.

The troopers told the men to come toward them to safer ground out of the high water, Timmons said. But at some point, an altercation broke out.

The troopers fired, killing one of the men, 35-year-old Nehemiah Fischer, according to Timmons. They arrested the other man, Fischer's older brother, Brandon, who was uninjured.

The shooting is under investigation.

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