HLN HD A high school gym teacher gives his friend a ride home but never returns; his wife and friend receive letters saying he started a new life, but they suspect foul play despite no body being discovered. 2026-10-21 A 16-year-old girl is killed in her own home by her mother and father. Her parents said they acted in self-defense, but the forensic evidence indicates otherwise. 2026-10-21 Investigators determine if a computer crash which almost ruined a manufacturing company was accidental or deliberate sabotage. 2026-10-21 A garbage bag leads police to a child's killer. 2026-10-21 An investigation into the disappearance of a young woman uncovers a tooth that helps police solve a crime without a body. 2026-10-21 The sensitive nose of a forensic examiner sniffs out murder. 2026-10-21 Discovering that an assault suspect is left-handed is crucial to a police investigation dating back 16 years. 2026-10-21 Forensic scientists try to find a way to "lift" the serial number from a shotgun that's their only clue in a case. 2026-10-21 Investigating the worst arson spree in U.S. history -- a rash of more than 75 fires near Seattle. 2026-10-21 Computers aid the police and FBI in solving a string of crimes. 2026-10-21 Using an anonymous letter and geographical profiling, investigators close in on a serial rapist, and a cleverly obtained DNA sample confirms their suspicions. 2026-10-21 When a young boy has serious respiratory problems and his father shows signs of early Alzheimer's disease, a chance encounter with a stranger kicks off an investigation into the cause. 2026-10-22