Deathiversary: Black Dahlia (January 15, 1947)

Today marks the deathiversary of Elizabeth Short aka The Black Dahlia. 72 years ago, Short was found dead, severed in half, drained of her blood with a smile carved into her mouth. Her killer has never been found. The grisly murder case remains unsolved to this day. What are some of your theories? Any favorite books on the case?