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JACKSONVILLE, Florida  — The Florida man charged with fatally shooting a 17-year-old boy after an argument over loud music testified Tuesday that he thought he saw the barrel of a gun from a neighboring vehicle pointed at him and that he feared for his life before firing his weapon.

Dunn is charged with first-degree murder. He has pleaded not guilty and says he acted in self-defense when he fatally shot 17-year-old Jordan Davis outside a Jacksonville convenience store in November 2012.

The trial comes less than a year after a former Florida neighborhood watchman, George Zimmerman, was acquitted in the killing of an unarmed black teenager, Trayvon Martin.

Both cases have stoked racial tensions. Dunn is white and Davis was black. No weapons were found in the SUV where Davis was riding with two other teenagers.