Deputies responded to a call for service at 7:31 p.m. in the 6200 block of Sierra Blanca Drive. Authorities say they found the woman dead in the car with a gunshot wound.
Investigators believe that the woman, her boyfriend, and her brother went to Sierra Blanca Drive to meet someone on Friday night when she was killed.
Deputies have identified the woman as 40-year-old Krystal Degeyter.
Investigators say her boyfriend and brother are cooperating with the investigation.