With pictures of her daughter and the words "Caravan To Catch A Killer" plastered all over it, Zingman's SUV can't help but raise eyebrows. But what she really wants is to raise awareness.

Zingman's daughter, Brittany Phillips, was murdered four years ago inside her Tulsa, Oklahoma apartment. Zingman says so far authorities have cleared nearly 2,000 people through DNA, but that's only with DNA that's been collected. She wants more DNA collected, with more laws. That's why she's taking her "caravan" cross country.

Zingman says the more attention she attracts, the better the chances of finding the man who killed her daughter.