If it weren't for forensic evidence, cases would never be solved. Watch Forensic Files, Tuesdays at 8/7c on Oxygen True Crime. | Oxygen

Revisit the moment twenty-six years after the murder of schoolteacher Christy Mirack, detectives get a break when a relative of the killer uploads DNA to a public genealogy website. Hear from the victim's brother and the forensic genealogist who helped crack one of the state's first cold cases to be solved by familial DNA technology. | Cold Case Files