Fitness Instructor Found Murdered Inside Texas Creekside Church. No Arrest So Far, and Motive Not Yet Identified

May 07, 2016 02:01 PM EDT

Midlothian Police is facing a blank wall in the case of a 45-year-old fitness instructor who was found dead inside Creekside Church near Dallas on April 18 with multiple puncture wounds in the head and chest.

Terri "Missy" Bevers, a mother of three, was last seen on the surveillance camera at 4:20 a.m to prepare for her 5 a.m. fitness class. She was apparently unaware of the danger from a man clad in police uniform and black helmet who broke inside with a hammer nearly an hour before she arrived.

No footage was available on the actual attack or how the two met, indicating the place where Bevers' body was found did not have a camera installed. The culprit was wandering from door to door moments before she arrived.

Close relatives of the victim could not even tell a probable motive to the murder except to say that she seemingly has a financial and marital problem.

Marsha Tucker, her mother-in-law, said her son was worried about his wife's pre-dawn classes.

"Her husband had told her to be prepared. You know he had worried about something like that, that early in the morning," said Tucker.

Mark Garcia, her gym buddy, said in recent weeks her friend didn't seem like herself acting like a little more reserved "like someone was after her."

Except separate warrants, the media obtained no other source of information about the murder. Police, on the other hand, uploaded the video on the internet to get more clue of the culprit.

"We really believe that somebody knows who this person is," Midlothian Assistant Chief of Police Kevin Johnson said in news conference.

"Creepy" message on the victim's professional media account LinkedIn is also being reviewed in the investigation.