Cops say a local DJ in Lancaster, Pennsylvania, is the coldblooded killer responsible for the death of Christy Mirack, a beloved teacher, more than a quarter century ago. Vince Mirack is Christy's brother, and he said the whole situation is “unbelievable.” The sixthgrade teacher was sexually assaulted and strangled in her home as she prepared to leave for school. The killer's DNA was retrieved at the crime scene but for all those years law enforcement was unable to find a match. #InsideEdition