Nightwing again set out to find Batman. From a group of crime bosses, Batman learned of Zucco's book - a ledger he'd kept about every crime and every criminal for the past 30 years. Alfred told Dick Zucco was getting out. He went to the release and found Batman watching. They witnessed as he was gunned down while leaving the prison.
Batman issues 436-442 are missing cover dates; the Grand Comic Book Database (www.comics.org) assigns this issue to "early September".