The Florida Department of Corrections said Monday that Officer Ian Gretka faces a charge of being a principal to malicious battery, a third-degree felony.
An arrest affidavit says Gretka hit the inmate 13 times in the rib cage.
Investigators say the attack occurred July 8 at Lake Correctional Institution in Clermont.
An unnamed inmate gave commentary on a five-minute video as the beating was happening. He shot the video through a cell window and sent it to another person, who uploaded it online.
Gretka has been fired.
Online court records showed no court docket and no attorney for Gretka.
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