An internal investigation has determined that a Fort Worth police officer was drinking on duty before crashing a city vehicle and killing a mother of two.

The Fort Worth Star-Telegram cited documents filed with the Civil Service Commission over the December incident.

The review found that Officer Jesus Cisneros drove to three bars and drank up to three beers in an unauthorized undercover detail before going off duty, drinking more and colliding with a vehicle driven by Sonia Baker.

The narcotics officer, who is charged with intoxication manslaughter, remains free on bail.

Cisneros resigned Dec. 21. Police on Feb. 18 took the additional step of suspending him indefinitely so the allegations would be included in his civil service record.

Cisneros' attorney Jim Lane did not immediately comment.

Baker family attorney Mike Freden says the actions of Cisneros were “sickening.”