A former North Texas police sergeant has been accused of sexually assaulting a woman he arrested on a traffic violations warrant.

A Tarrant County grand jury Wednesday indicted ex-Dalworthington Gardens police Sgt. Bobby Beasley on a charge of sexual assault.

An attorney for Beasley says he's innocent.

The woman says Beasley, in December 2010, was wearing civilian clothing but his badge and gun were displayed. She allegedly was molested while in a vehicle with Beasley.

The Fort Worth Star-Telegram reports the woman, when reporting the incident last April, told police she feared no one would believe her because she's black and Beasley is white.

Beasley resigned when the allegations began public. If convicted, he could face 20 years in prison.

Details on the traffic case weren't immediately available.