A new History series invites top detectives and coders to resolve the gruesome almost 50-year-old mystery."The Zodiac Killer is the most notorious unsolved murder cases in the history of the United States," retired Detective Supervisor in Criminal/Gang Homicide Division of LAPD Sal LaBarbera tells us. Sal along with Ken Marine Corp vet and cold case specialist Kenneth Mains and a team of computer code crackers are determined to solve this serial killer mystery in History’s brand-new series, The Zodiac Killer: Case Close? [Read more: The best shows on BT TV this month] Here's all you need to know about the...