Former Enron executive David W. Delainey (front), a Canadian, leaves Federal court in Houston in shackles escorted by U.S. Marshalls after being sentenced to 30 months in prison for insider trading September 18, 2006. Delainey, who cooperated extensively with the U.S. Justice Department Enron Task Force had been praised by prosecutors for his help in the case against Enron founder Ken Lay and former CEO Jeff Skilling. REUTERS/Richard Carson (UNITED STATES)