I was hoping for a conclusion on this case, but that was not to be had. There is another name being tossed around as a possible suspect. DNA from this man was taken from an envelope, but was not tested against the sample the police had.
The daughter of another possible suspect was not featured in this episode. The episode may have been filmed before she came along.
The retired police dispatcher listened to a tape of the suspect in this show and believes it could possibly be him. She did not sound that convincing at first.
The subject of the Zodiac Killer is a fascinating one. I wish the show would of postponed this episode and also featured the other suspect. His daughter is having her DNA tested to see if her deceased father is the killer.