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as Robert Graysmith
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as Inspector David Toschi
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as Paul Avery
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as Inspector William Armstrong
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as Melvin Belli
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as Arthur Leigh Allen
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as Jack Mulanax
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as Melanie
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as Al Hyman
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as Templeton Peck
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as Charles Thieriot
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as Carol Fisher
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as Captain Martin Lee
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as Zodiac 1 / Zodiac 2
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as Zodiac 3
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as Zodiac 4
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as Captain Ken Narlow
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as Mrs. Toschi
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as Darlene Ferrin
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as Young Mike Mageau
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as Cecilia Shepard
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as Sherwood Morrill
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as Father
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as Lab Tech Dagitz
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as Cabbie / Paul Stine
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as Shorty
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as Jim Dunbar
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as Mike Mageau
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as Woman
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as Inspector Kracke
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as Mel Nicolai
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as Riverside Captain
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as John Allen
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as Catherine Allen
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as Terry Pascoe
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as Police Commissioner
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as Duffy Jennings
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as Officer George Bawart
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as Bob Vaughn
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as Linda del Buono
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as Sandy Panzarella
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as Detective #1
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as Donald Cheney
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as Copy Editor #1
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as Copy Editor #3
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as Copy Editor #4
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as Detective #2
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as Camera Man
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as Reporter
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as Prisioner
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as Informant
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as Informant
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as Patrolman Fouke
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as Detective Roy
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as Kathleen Johns
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as Uniform Cop
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as Informant
