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After a nearly 20-year absence, the notorious San Francisco serial killer, ""Zodiac,"" returns to taunt Nash as well as haunt Nash's mentor (who has since retired). But is it the actual Zodiac, or just a lethal copycat? Meanwhile, Joe goes undercover as a bike messenger to nab a free-wheeling drug dealer.
First Air Date : Mar 29, 1996
Last Air date : May 04, 2001
Episode : 122 Episode
Season : 6 Season
Runtime: 45:60 minutes
Studio: CBS
Country: United States of America
