Chris Swinney, aka C. L. Swinney, currently works as a deputy sheriff in the San Francisco Bay Area.  

He has written the following true crime books:
    
Robert Pickton: The Pig Farmer Serial Killer
The Killer Handyman: The True Story of William Patrick Fyfe
Robert Black: The True Story of a Child Rapist and Serial Killer
Deadly Voices: The True Story of Herbert Mullin
Peter Manuel: The Beast of Birkenshaw
Cleophus Prince: The Clairemont Killer
James Fairweather: Britain's Youngest Serial Killer
Monster: The True Story of Peter Kurten
   
Chris also wrote a highly-successful and best-selling crime fiction series. The following are the four novels in his police procedural series:

Gray Ghost
The Cartel Enforcers
Sin City Assassin
Full Circle