Mayer Brown partner Joseph P. Collins was found guilty Friday of conspiracy and four other charges in connection with a massive fraud at now-bankrupt Refco Inc.

Collins, who testified in his own defense that he was kept in the dark about more than $2.4 billion in debt hidden by top officials at the financial services firm, bowed his head and closed his eyes in pain as the jury foreman recited the guilty verdicts before Southern District of New York Judge Robert P. Patterson.