Publicity
The number of books and movies that have been made about the Zodiac and people that know about him proves his legacy. This killer made people listen to him, he made himself known even if his true identity was never revealed. If the Zodiac was still alive he would be proud of all the attention his case still gets to this day. This type of attention is exactly what he wanted out of his killings.
" The Zodiac case grew so big because of all the media attention. It had a life of its own. Still today there are so many books and movies about the case." Det. Wilson.