Cold Case Files is a 1999–present documentary television series on the cable channel A&E Network hosted by Bill Kurtis that documents the investigation of various long-unsolved murders (referred to as "cold cases" in detectives' parlance) through the use of modern forensic science (especially recent advances in DNA techniques), and criminal psychology, in addition to recent breakthroughs in the case(s) involving previously silent witnesses. According to A&E, the show has been widely praised by law enforcement agencies and its investigative reports are commonly used in the training of detectives. It has also served as inspiration for a number of popular later police dramas on network television (i.e. Cold Case).

Source: Wikipedia.org