Here are the SF Chronicle articles written at the time of Sgt. Radetich’s murder. I am including the articles about the suspect, even though he was later cleared, to emphasize how well publicized the hunt for this suspect really was and show that Zodiac took a big risk in claiming to have killed a man in a car with a .38 if he was referring to Sgt. Radetich.

Here is a link to an article written in 2007 that does show the case is still open and the suspect Johnson was cleared.

http://www.sfgate.com/news/article/1967 … 654263.php