A Metro police officer who violently beat a man earlier this month after he wouldn't leave a light rail station resigned Monday morning.

Officer Jairus Warren, who joined Metro in November, tendered his resignation after an internal investigation determined he should be fired for use of excessive force. The incident was captured on Metro's surveillance cameras used at all train platforms.

"You will see excessive force being used on the video," said Vera Bumpers, chief of the Metropolitan Transit Authority Police.

Metro has turned its internal investigation over to the Harris County District Attorney's Office, Bumpers said. Any criminal charges will be up to them, she said.

Warren and another officer, D. Reynoso, approached Darrell Giles around 7:30 a.m. Sept. 14. It was not the officers' first contact with Giles, Bumpers said.

"They had dealt with him a couple of times earlier that morning," she said. "He was combative and was not cooperative on any occasions."

The video, which contains no audio, shows Warren telling Giles to get on his feet during a brief exchange. The two exchange words, and Warren possibly kicked at Giles, who sprang quickly to his feet, based on the video.

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Warren already was clutching a collapsible baton as he spoke to Giles, and when Giles stood, Warren began striking him with the baton, inflicting at least 10 strikes.

"There is no reason why any officer allowed their emotions to get that far," Bumpers said.

Reynoso, after a few seconds, intercedes and stops Warren after Giles fell to the concrete of the rail platform.

Bumpers said Reynoso brought the incident to supervisors' attention and will receive additional training but not further discipline because he was not involved in the use of force.

Organizers of the Black Lives Matter movement in Houston pressed Metro to release the video of the incident, and investigate the matter thoroughly. After Warren's resignation and Bumpers' statements and the release of the video, organizers were satisfied with Metro's response, said Kaelyn Bibb, a Houston-area organizer.

"She didn't seem satisfied, or pleased about this situation either," Bibb said of Bumpers.

Bibb said the focus of the group will shift to seeking criminal charges.

The incident will also serve as a reminder for other officers, Bumpers said, but not lead to changes in current training practices.

"This incident is not a reflection of the men and women who work for Metro Police," she said.