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.

Community man William "Michael" McCuen sustained 17 stab wounds — including a fatal one to the heart — in an ambush that began while he was asleep in his Anderson County home.

Kelly Siegler and Abbey Abbondandolo join the Beaumont Police Department in their investigation into the mysterious 1999 disappearance of Kimberly Langwell.