In many ways, Columbus, Miss., with a population of 30,000, is an unremarkable small Southern town. "It's a nice place to live, there are a lot of nice people," resident Jane Harmon has said. "But there are a lot of strange things that happen." Chief among those strange things is the fact that between 1996 and 1998 there were five murders that are still unsolved. Correspondent Harold Dow reports on what may be the work of a serial killer.