A defense lawyer for former Dewey & LeBoeuf chairman Steven Davis spent most of the day on Monday challenging the statements of former Dewey finance director Francis Canellas, whose testimony last week suggested that Davis knew about allegedly improper accounting adjustments at the firm.

Canellas is a key witness in the Manhattan district attorney’s case against Davis, former Dewey executive director Stephen DiCarmine and former firm CFO Joel Sanders. Prosecutors in the ongoing criminal trial in New York State Supreme Court claim that the trio fraudulently deceived lenders and investors about Dewey’s finances before the firm went under in 2012.