After 18-year-old Brittany Phillips was raped and strangled to death in her Tulsa, Oklahoma, apartment in 2004, her mother waited for answers. But Dr. Maggie Zingman is no longer waiting. The mom is driving around the United States in a hard-to-miss vehicle wrapped with her daughter’s photo and details about her murder, raising awareness to the case in the hope someone who knows something will come forward.

Zingman caught Nancy Grace’s attention as she traveled through Atlanta and was invited to the Crime Stories studio to discuss the search for her daughter’s killer. They are joined by Cold Case Research Institute director Sheryl McCollum.

“Crime Stories with Nancy Grace” is also a national radio show heard on SiriusXM channel 111 airing for two hours daily starting at 12 p.m. ET and around the country on local radio stations. You can also subscribe and download the daily podcasts at iTunes and Google Play.

[Feature Photo: Maggie Zingman, Sheryl McCollum via Leigh Egan]