SAN ANTONIO – A Bexar County detention deputy was arrested Tuesday on a charge he sexually assaulted a female inmate.

The victim said Erick Montez, 35, had sex with her while he was on duty in one of the Bexar County Sheriff’s Office transportation vans on Dec. 27, 2015.

A criminal complaint said surveillance video showed Montez in full uniform transporting the alleged victim from the county’s annex to the jail. The complaint said “there was no reason for the complainant to be transported during midnight hours.”

The complaint said Montez parked the van in the Bexar County parking lot, “exited the driver side and approached the complainant in the back seat area.”

It said the nine-minute-long incident included Montez “pulling the complainant towards him in a forceful way.”

The complaint also said Montez admitted he had sex with the alleged victim.

Montez was charged Tuesday with sexual assault and violating the civil rights of a person in custody. At this time, Montez has not yet seen a magistrate judge, so no bond has been set.

“We have a responsibility to protect an estimated 4,000 inmates who are housed in the Bexar County Adult Detention Center,” Bexar County Sheriff Pamerleau said Tuesday. “What Montez is accused of doing is a disgrace. He didn’t just violate this woman, he violated the public’s trust and the badge that hundreds of our deputies wear with pride every day. We will not tolerate this sort of behavior.”

Montez is on administrative leave while the Sheriff's Office begins the process of firing him. He was hired in November 2008.

The Sheriff's Office is encouraging anyone else who may have been victimized by Montez to call 210-335-TIPS (8477).