His Name Was Arthur Leigh Allen

Robert Graysmith Himself - Author of 'Zodiac' and 'Zodiac Unmasked'

Arthur Spinelli Himself - Former Solano County Saloon Owner

Donald Cheney Himself - Former Friend of Arthur Leigh Allen

Sandy Panzarella Himself - Friend of Donald Cheney & Acquaintance of Arthur Leigh Allen

Norman Boudreau Himself - College Friend of Arthur Leigh Allen

George Bawart Himself - Vallejo Police Dept (Ret)

Sharon Pagaling Hagon Herself - Criminal Profiler

Donald Fouke Himself - San Francisco Police Dept (Ret)

David Slaight Himself - Napa County Sheriff Dept (Ret)

Nancy Slover Herself - City of Vallejo '355' Operator

Kim Rossmo Himself - Research Professor, Department of Criminal Justice, Texas State University