The Donna Payant Case When the body of a female prison guard shows up in a landfill, investigators immediately view hundreds of prisoners as suspects. The medical examiner not only identified the cause of death, he found an important clue. It was a ""signature"" element to the crime, and was similar to a murder the medical examiner investigated ten years earlier. When he checked further, he discovered that the same perpetrator was an inmate at the same prison. Was it possible that the inmate committed this crime, too? (thetvdb.com)