Scott Walker delayed shooting for 5 months so he could shoot on the cusp of fall, starting with no snow and ending in deep winter. He has said he literally wanted the feel of the weather closing in on the story, freezing the case.
When Halcombe is reviewing files in connection to the missing girls, the photos he looks through, and the ones on the wall at the police station later (with the exception of Vanessa's character) are those of the real life victims.
Jack Halcombe is based on retired Alaska State Trooper Detective Glenn Flothe.
Robert Hansen died August 21, 2014, at Alaska Regional Hospital in Anchorage. He was 75. During the making of this movie, he was still alive.
Two of Robert Hansen's real-life victims have never been identified. One woman's remains were found in 1980, the other in 1984.
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