KnowraZodiac KillerLinked fromLinked fromThe 3 pages that link to Zodiac Killer, each with the reason it gives.All 3Broader topic 2Related 1True crimeBroader topic: Unsolved identity and coded letters sustain decades of true-crime investigation and retelling.Circumstantial evidenceRelated: The unresolved identity demonstrates the limits of accumulating indirect clues without decisive identification.Cold caseBroader topic: The case shows how extensive publicity and surviving clues can still fail to establish an identity.