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After a teenage girl shows up dead, investigators think they know who did it. However, when another pair of sisters are found deceased with a similar MO, investigators realize they not only have the wrong man but a possible serial killer. SimpliSafe - Right now, get 20% off any new SimpliSafe system with Fast Protect Monitoring at SimpliSafe.com/COLDCASE There’s No Safe Like SimpliSafe. ZocDoc: Check out Zocdoc.com/CCF and download the Zocdoc app for free!