Zodiac Cracked: The Manifestation of a Killer
Marianne Koerfer is a retired Police Secretary and a native Chicagoan. She is the author of two civic articles, Creating Opportunities for The Employee Who is Disabled and Law Enforcement Opportunities. Her current focus is directed toward reviewing, researching, and writing about cold cases. She strives to bring long neglected cases out from the archives and back into the open case status by developing a fresh profile of a viable suspect through an intense reinterpretation of the evidence and circumstances of these dark crimes.