Three cases from The First 48 archive that left detectives wondering why long after the case was closed. In Harris County, Texas, investigators are stunned to find an elderly woman gunned down taking groceries from her car. Then, in Dallas, a chance encounter on the street leaves one man dead and another in the hospital. And in Atlanta, in a case that keeps changing course, detectives search for the killer of a man shot point blank in a house full of cash.