One day in 1897, a neighbor boy sent on an errand found the recently married Elva Zona Heaster's lifeless body at the foot of her stairs. Her mother suspected foul play, but nobody else seemed to put the pieces together. And then a ghost appeared.

Sources:

Eight Amazing History Stories. Today I Found Out. July 16, 2012. http://www.todayifoundout.com/index.php/2012/07/8-history-stories/

Sonaik, Matt. The Ghost Who Helped Solve Her Own Murder. Mental Floss. September 24, 2014. https://www.mentalfloss.com/article/30608/elva-zona-heaster-ghost-who-helped-solve-her-own-murder