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In Philadelphia, the brazen killing of a state's witness leads police to an alleged hitman - but could the evidence against him be nothing more than smoke and mirrors?
In Texas, a 17-year-old with a violent past is named the killer in a drug deal gone wrong - but a misidentified bullet could unravel the case.
Bite marks on a murder victim's body twice lead to Ray Krone's conviction - but the DNA evidence tells another story.