Robert and Kate.

In 1876, Robert Southern was the most eligible bachelor in Pickens County, Georgia. Kate Hambrick and Narcissa Cowan were rivals for his affection. Kate was the winner; she and Robert married that autumn. But Kate’s victory was short-lived; Robert was still secretly seeing Narcissa. At a Christmas party that year, he danced with Narissa and paid her more attention than Kate thought proper. Kate Southern solved the problem by stabbing her rival in the chest with a penknife. 

Read the full story here: Mrs. Southern's Sad Case.