In 1978, a Texan-born man went on national TV, competing in and ultimately winning an episode of the popular American game show The Dating Game. This man was, according to host Jim Lange, a "successful photographer" who you might find "skydiving or motorcycling." Left out of that description – unknown to Lange, the show's producers and millions watching at home – was a terrifying secret: that Rodney Alcala was a rapist and murderer, who would eventually be sentenced to life in prison. He died...