(AP) — Their daughters' killer is behind bars, but to the parents of the two Bethlehem girls murdered at the Lehigh University Lookout 20 years ago, the crime remains a riddle. On June 29, 1995, Jennifer Grider, 17, and her best friend, Mary Orlando, 15, were shot to death at the Lookout, a scenic and secluded spot overlooking the city that's been a popular teen hangout for decades. On Nov.