I have identified two nonfiction books that contain significant information about the murders:

Ready to Hang: Seven Famous New Orleans Murders by Robert Tallant (New York: Harper, 1952).

Serial Murder and Media Circuses by Dirk Cameron Gibson (Westport, Conn.: Praeger Publishers, 2006).

And one novel based on the story:

The Axeman's Jazz: A Skip Langdon Novel by Julie Smith (New York: Ivy Books, 1992).

And two collections of stories that contain some material based on fact:

The Edge of the Chair: Anthology by Joan Kahn (New York: Harper & Row, 1967).

French Quarter Fiction: The Newest Stories of America's Oldest Bohemia by Joshua Clark (New Orleans: Light of New Orleans Pub., 2003).