At trial, a lawyer for ranger Chad Walder said he was on the verge of being disarmed when he fired three times in self-defense.
Mann died nine days later.
Prosecutor James Santulli said Mann was unarmed and standing about five feet away with his hands up when Walder fired.
Mann was 45 and a resident of Monroe, N.Y.
The jury deliberated for two days. The charge carried a maximum 10-year prison sentence.
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