A 45-year-old fitness trainer and mother of three was found dead in a Texas church Monday morning, and surveillance footage reveals a man dressed as a police officer roaming the halls around the time she died.

Students of Terri “Missy” Bevers' Camp Gladiator fitness class discovered her body inside Midlothian's Creekside Church around 5 AM. (Midlothian is about 25 miles southwest of Dallas.)

Surveillance footage shows a man walking the halls of the church in police tactical gear around the time Bevers is believed to have died. Investigators found evidence of a forced entry and think Bevers may have walked in on a burglary.

Detectives have not said how Bevers died, but they told KTVT-TV the suspect assaulted Bevers and left her lying unresponsive.

Police said nothing appeared to have been stolen from the church, but that there was a substantial amount of damage inside.

Bevers leaves behind three girls ages 8, 13, and 15.

Anyone with information about this crime is urged to call the Midlothian Police Department at 972-775-3333.