>> that story was about a young man who murders his parents and inherits $157 million. >> fancy that. erik wrote the screenplay with a close friend of his named craig cignarelli. when detective zoeller interviewed craig, he learned that craig and erik often fantasized about committing the perfect crime. which, in their screenplay, became the story of a man killing his parents and evading police. >> they thought about the perfect crime. and here their parents are murdered. we don't have a suspect yet. it's looking like a perfect crime to me, at that point. >> zoeller began to wonder if erik's fantasy could be playing out in reality. and then craig told zoeller about his visit to the menendez house after the murders. >> erik said, "do you wanna know what happened? " and he described shooting the parents. and then he summed it all by saying, "it could happen." and craig thought about it.