Officer Oneta Sampson Carney was loading her car with her husband outside an Evergreen Park Sam's Club last year, when three men approached them, prosecutors previously said.
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That's when they said two of the men offered to help the couple, while a third jumped in the driver's seat and drove off.
Prosecutors said Carney then fired her gun, hitting the pavement behind the car.
They said the men didn't show a gun or threaten the couple.
RELATED: Off-duty cop facing charges after allegedly firing gun at suspected carjackers in Evergreen Park
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No one was hurt.
Carney was charged with felony reckless discharge of a firearm, but was found not guilty in a one-day bench trial Tuesday.
Chicago's Civilian Office of Police Accountability was investigating the incident, and Carney was facing dismissal as of a May Chicago Police Board decision.
Sun-Times Media contributed to this report.