Police closed the case of the infamous Boston Strangler when handyman Albert De Salvo confessed to the grisly murder of 13 women. But recent forensic evidence reveals that in at least one of the murders - and possibly all of them - police may have had the wrong man. Some even theorize that the strangler may be walking free today. Now, the National Geographic Channel investigates in The Hunt for the Boston Strangler.

In 1971, a hijacker, named Dan Cooper, parachuted from a plane with a request of $200,000, crafting the FBI's only unsolved hijacking case. With help of modern forensics, experts hope DNA analysis will solve the mystery.

When Russia's last tsar, Nicholas II, and his family disappeared almost 100 years ago, eyewitness accounts indicated the family was brutally murdered. Now, the National Geographic Channel takes viewers inside this famous murder mystery. Follow along as forensic scientists attempt to identify remains that were discovered near the possible murder site. Will modern science shed new light on the Mystery of the Romanovs?