Greg Markwardt kills his sister-in-law, Kathy Odom, in 1987. He remains free for nearly two decades, but new DNA techniques allow a lamp cord from the scene to be tested, proving his DNA to be a match and forcing his arrest and subsequent conviction. In 1987, Kathy Odom is found stabbed to death in her home. There are several signs suggesting that she knew her attacker, but detectives cannot make an arrest. Years later, a new technique is developed that allows DNA to be collected from items used in a murder. The lamp cord that was tied to Odom's wrist is subsequently tested for DNA. Her brother-in-law, Greg Markwardt, turns out to be a match for the profile and after fifteen years, is arrested for the murder of Kathy Odom.