Kenneth Lay

Ken Lay heads to the federal courthouse in Houston April 19, 2006 in this file photo. Lay, founder and vilified former chairman of scandal-ridden Enron Corp., died of a heart attack Wednesday, July 5, 2006. He was 64.

Former Enron chairman Kenneth Lay pauses with Houston police officer K.R. Perkins as he walks to the Bob Casey U.S. Courthouse during his bank fraud trial May 22, 2006 in Houston.

Ken Lay heads back to the federal courthouse in Houston after a lunch break in his trial March 27, 2006, in this file photo. Lay, founder and vilified former chairman of scandal-ridden Enron Corp., died of a heart attack Wednesday, July 5, 2006. He was 64.

Enron founder Ken Lay returns to the federal courthouse in Houston with his wife Linda, left, after a lunch break in this March 8, 2006 file photo. Lay, 64, died Wednesday July 5, 2006, in Aspen Colo. Of a massive heart attack.

Ken Lay and his wife Linda make their way to federal court in a Houston file photo from Jan. 31, 2006, for the Enron fraud trial. Lay, founder and vilified former chairman of scandal-ridden Enron Corp., died of a heart attack Wednesday, July 5, 2006. He was 64.

Enron founder Ken Lay talks to reporters outside the federal courthouse after the completion of jury selection in his trial in this Jan. 30, 2006 file photo in Houston. Lay, who was convicted in May of helping perpetuate one of the most sprawling business frauds in U.S. history, died of a heart attack Wednesday, July 5, 2006. He was 64.

Former Enron CEO Kenneth Lay is escorted from a car to a federal court by a law enforcement official after being indicted for wire fraud and conspiracy July 8, 2004 in Houston. The government unsealed an 11-count indictment charging Lay in a cover-up of Enron's finances designed to deceive the public, company shareholders and government regulators about the one-time energy giant which imploded in December of 2001.

Former Enron Chairman Kenneth Lay raises his right hand as he is sworn in before the Senate Committee on Commerce, Science and Transportation February 12, 2002 in Washington. Lay cited his Fifth Amendment right against self-incrimination and refused to answer questions from committee members about his role in the collapse of the former energy trading giant.

Former Enron Chairman Kenneth Lay reads a statement before the Senate Committee on Commerce, Science and Transportation February 12, 2002 in Washington. Lay cited his Fifth Amendment right against self-incrimination and refused to answer questions from committee members about his role in the collapse of the former energy trading giant.

The entrance of energy trader Enron's corporate headquarters in downtown Houston as seen in this Jan. 9, 2002 file photo.