There's a reason veteran homicide investigator Steve Spingola called Kelly Siegler "the Taylor Swift of cold cases" in the Season 7 updates special episode.
In a Cold Justice two-part special, Kelly Siegler and South Carolina investigators examine who could have stabbed and shot a married couple and their elderly mothers.
Derby Wagner-Richardson was abducted from her security post in Racine, Wisconsin, and found dead in the trunk of her car. Now, just over 37 years later, her estranged husband has pleaded not guilty.