Erie County District Attorney Frank Sedita III says the grand jury dismissed a more serious felony charge of second-degree robbery.
Kane and his cousin, James Kane, were arrested Aug. 9 after 62-year-old cabbie Jan Radecki told police they attacked him when he said he didn't have 20 cents change for the fare.
James Kane was indicted on the same charges.
The Kanes earlier pleaded not guilty to the charges. They are scheduled to be arraigned at 2 p.m. Thursday. Patrick Kane's lawyer, Paul Cambria, was not immediately available for comment.