Bill Kurtis examines one of the most infamous cold cases in Los Angeles history -- the 1947 murder of actress Elizabeth Short, who was found nude and cut in half in an empty lot. Though charges have never been filed in the case, theories abound, and Kurtis investigates some of the most prominent ones. He talks to a retired LAPD detective whose 3 year investigation led to the stunning conclusion that his own father committed the murder. Kurtis also probes the theory that the killer was a surgeon named Walter Bayley. Kurtis finally explores the possibility that there may have been a police cover-up in the case to protect the real killer.