The long-powerful Fumo faces more than a decade in prison at his July sentencing on 137 counts.
Luchko pleaded guilty to conspiracy and obstruction, but continued to support Fumo in e-mails and blog postings. Prosecutors had to scratch him as a witness at Fumo's trial.
The 52-year-old Luchko testified Wednesday that he realized only belated that Fumo was "a crook" and that he was "a criminal." He calls his 10 years of work for Fumo a lie.
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