A Harris County grand jury has indicted a former Metro police officer for assault, following a violent baton beating of a man at a light rail terminal earlier this month.

Harris County District Attorney Devon Anderson’s office announced the indictment of Jairus Warren on Wednesday afternoon. Warren resigned Monday from the Metropolitan Transit Authority Police Department, after an internal investigation suggested that he be fired.

RELATED: Metro police officer says video shows 'excessive force'

Warren and another officer, Daniel Reynoso, were trying to remove Darrell Giles from the Burnett Transit Center stop at about 7:30 a.m. on Sept. 14. After a brief discussion, Giles jumped to his feet and Warren immediately began striking him with a collapsible baton. The incident was captured on Metro’s surveillance video.

“The video is very disturbing,” Anderson said in a release. “When we have compelling evidence such as this, we immediately initiate an investigation. The case was presented to a diverse grand jury and we wholeheartedly support their decision. This officer used excessive force and should not be wearing a badge.”

If convicted of assault, Warren could face a year in jail and up to a $4,000 fine.

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Meanwhile criminal charges were dropped against Giles, who Warren and Reynoso arrested on suspicion of criminal trespass and resisting arrest, the district attorney's office said.