Some rare findings. All paperback but one. 

The Complete Jack the Ripper, Donald Rumbelow, 1975, hardcover. 

Whoever Fights Monsters, Robert K. Ressler and Tom Shachtman, 1993.

People who eat darkness, Richard Lloyd Parry, 2012.

Two of a kind, the hillside Stranglers, Darcy O'Brien, 1985. 

Journey into Darkness, John Douglas and Mark Olshaker, 1997. 
Coroner, Thomas T. Noguchi, MD. with Joseph Dimona, 1984.  

BK, the Life and Crimes of the BTK Serial Killer, Stephen Singui, 2006.

Zodiac Unmasked, Robert Graysmith, 2007. 

The Night Stalker, the Life and Crimes of Richard Ramirez, 2016. 

The Dracula Syndrome, Richard Monaco and Bill Burt, 1993.

The Jeffrey Dahmer Story, an American Nightmare, Don Davis, 1991.

Killer Clown, the John Wayne Gacy Murders, Terry Sullivan with Peter T. Maiken, 2013.

Mind Hunter, inside the FBI's Elite Serial Crime Unit, John Douglas and Mark Olshaker, 1996. 

I will be gone in the dark, one woman's obsessive search for the golden state killer, Michelle Mcnamara, 2018.