Ellen Goldberg, NBCDFW.com
Plano police say they have not narrowed down a suspect list in the slaying of Susan Loper.
Officials remained tight-lipped Thursday as they continued to investigate the violent death of a fitness instructor after her body was found Wednesday morning in a field.
The Plano Police Department is not confirming published reports that say officers executed a warrant at the residence of a former boyfriend of Susan Loper or that he has not been found or that he is even a person of interest.
"Some individuals or people of interest that we're looking at, they stand out a little bit more than others, but at this time we're not naming any single suspect," Officer Rick McDonald said.
"I wish we could say we knew who did it and that there was only one possibility or two possibilities, but I can't at this point," he said.
Loper, a single mother, is believed to have been abducted Tuesday morning from the Gleneagles Country Club where she was a Pilates instructor. Investigators said evidence in her vehicle indicated that she had been abducted and that a struggle had taken place both in the car and in the club -- but they didn't specify what evidence they found.
The Texas Rangers and the U.S. Marshal Service is assisting Plano police in the investigation.
Grief counselors have been made available to Loper's son and his classmates at Gunstream Elementary School in Frisco.
Loper's former husband, Craig, was cordial when speaking with NBC DFW on Thursday, but while fighting back tears, said he didn't have a statement to make at this time.
In lieu of flowers, Loper's family and friends ask that donations be made to help secure her 8-year-old son's future.
"She was his rock, and he doesn't have that anymore," said Julie Mitchell, who has been friends with Loper since they were teenagers. "[We're] just hoping it will give him some stability and security when it comes to his future."
Checks can be made payable to "Jake Loper Trust" in care of the Ferguson Law Group at 2500 Dallas Parkway, Suite 260; Plano, TX 75093.
NBC DFW's Randy McIlwain and Ellen Goldberg contributed to this report.