After seven days of testifying against his former bosses at Dewey & LeBoeuf—which included heated questioning from both the prosecution and defense and at one point led to tears on the witness stand—former finance director Francis Canellas concluded his role as the prosecution’s key witness in the fraud trial of the collapsed firm’s top leaders.

Canellas, a witness who agreed to testify at trial in exchange for leniency, was viewed as a crucial link between ex-chairman Steven Davis, former executive director Stephen DiCarmine and former chief financial officer Joel Sanders, and the accounting fraud at the heart of the criminal case.