A Christian woman was killed in a church in Texas on Monday morning by a man dressed in SWAT gear, according to police.

Terri (Missy) Bevers, a fitness instructor, was found at approximately 5:00 AM by people planning to attend her fitness class Camp Gladiator at the Creekside Church of Christ, according to the Midloathian Police Department.

A man with a helmet, gloves and heavy vest with "POLICE" written on it was caught on camera footage inside the church just before Bevers, 43, arrived, according to Police Chief Carl Smith.

"His intent was to look like a police officer," said Smith.

There was no footage of the attack itself.

Detectives said they did not see a weapon on the suspect in the video, apart from a tool he used to smash windows.

"She was actually found by one of the boot camp participants who got there a little bit early and waited outside for a while until others got there," police spokesperson Captain John Spann told WFAA.com.

"They went in the building where they located her."

The motive for her killing is not known.

"We are exploring all possibilities," said Smith at a news conference.

"It certainly is a strange occurrence for a church to be burglarised this time of morning," he said. "It's just and odd, random situation."

Bevers was described by a friend to WFAA.com as "a woman of God who loved her husband, children and friends".