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An Immigration and Customs Enforcement agent indicted in Utah for allegedly slamming a man's face into the floor pleaded not guilty during a Wednesday appearance in federal court.

The agent, Jon Martinson Jr., was indicted in June with violating the man's constitutional rights while acting as an officer.

The alleged victim is identified only by his initials in the indictment, which does not confirm whether he was in the country illegally.

On July 3, 2013, "[Martinson] slammed F.M.P. onto the concrete floor face first," the indictment reads, "willfully depriving him of the rights secured and protected by the Constitution and laws of the United States, to be free from the use of unreasonable force by a law enforcement officer."

A three-day jury trial is set for Oct. 6 before U.S. District Judge Dee Benson.

Meanwhile, Martinson is free on supervised release.