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29 Unsolved Murders That Will Send Shivers Down Your Spine
Uncovered: Cold Case Files for Murdered or Missing People
DNA Evidence Just Solved One Of The Oldest Cold Cases Ever : NPR
Project: Cold Case
Project Cold Case Database
Unsolved Murders: The 6 Most Mysterious of All Time | TIME
The Most Notorious Unsolved Crime, Cold Case in Every State
This Florida nurse’s killing remained unsolved for 3 decades
U.S. unsolved murder rates are at a record high : NPR
Homicide database: Mapping unsolved murders in major U.S. cities