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Law-enforcement agencies have various definitions of what constitutes a “cold case.” For the Illinois State Police, a case becomes “cold” when an investigation for a murder, kidnapping, abduction or missing person “is pending due to insufficient solvability factors.” These include a lack of witnesses, leads, identifiable marks or other physical evidence, said state police spokesman Isaiah Vega. Meanwhile, when a murder case in Chicago goes inactive for a year, it’s typically turned over to the cold case unit of the Chicago Police Department, which handles more than 5,000 open cases, said Chicago Police Sgt. Will Svilar.
