February 7, 2002 - Andrew Fastow, Michael Kopper, Richard Buy, and Richard Causey all invoke their Fifth Amendment rights before the House Energy and Commerce Committee.
February 12, 2002 - Kenneth Lay invokes his Fifth Amendment right before the Senate Commerce Committee.
February 14, 2002 - Whistleblower Sherron Watkins testifies before the House of Representatives.
February 26, 2002 - Jeffrey Skilling, Sherron Watkins, and Jeffrey McMahon testify before the U.S. Senate Commerce Committee.
March 14, 2002 - U.S. Justice Department indicts accounting firm Arthur Andersen for obstruction of justice in the Enron case.
April 2002 - Enron rises to No. 5 on the Fortune 500 list despite its bankruptcy filing. Fortune bases its rankings only on the first nine months of revenue in 2001, which total $138.7 billion.
June 15, 2002 - Arthur Andersen found guilty of obstructing justice.
August 21, 2002 - Former Enron executive Michael Kopper pleads guilty to conspiracy to commit wire fraud and money laundering conspiracy.
October 2, 2002 - Andrew Fastow is charged with securities fraud, wire fraud, mail fraud, money laundering, and conspiracy.
May 1, 2003 - Andrew Fastow, his wife, and seven others are charged in a superseding indictment for actions relating to the firm's financial scandals.
January 8, 2004 - Judge David Hittner, says he will accept Lea Fastow's plea deal in exchange for a guilty plea that could reduce her prison time.
January 14, 2004 - Andrew and Lea Fastow each plead guilty, as part of a plea agreement.
January 22, 2004 - Richard Causey pleads not guilty to five counts of securities fraud and one count of conspiracy to commit securities fraud.
February 19, 2004 - Former Enron CEO Jeffrey Skilling is indicted on fraud and conspiracy charges and pleads not guilty.
May 6, 2004 - Lea Fastow pleads guilty to a single count of filing a false tax return and receives a 12-month sentence.
May 19, 2004 - The former Enron vice president responsible for investor relations, Paula Rieker, pleads guilty to insider trading.
July 7, 2004 - Lay is indicted on 11 counts - one count of conspiracy to commit security and wire fraud; two counts of wire fraud for misleading statements at employee meetings; four counts of securities fraud for false statements in presentations to securities analysts; one count of bank fraud; and three counts of making false statements to banks.
July 8, 2004 - Lay pleads not guilty to all 11 charges and is released on $500,000 unsecured bond.
November 3, 2004 - The first criminal trial ends with the acquittal of former accountant Sheila Kahanek.
November 17, 2004 - Enron comes out of bankruptcy after selling its interest in three natural gas pipelines to CCE Holdings for $2 billion.
May 31, 2005 - The U.S. Supreme Court overturns Arthur Andersen's obstruction of justice conviction.
December 28, 2005 - Richard Causey pleads guilty to securities fraud for his role in the Enron scandal. He will serve only seven years in exchange for cooperating with prosecutors seeking convictions of his former bosses, Lay and Skilling.
March 28, 2006 - The judge dismisses three counts against Skilling (two charges of securities fraud and one charge of lying to auditors) and one count of securities fraud against Lay.
May 25, 2006 - The jury in the Enron case finds former CEO Jeffrey Skilling and founder Kenneth Lay guilty of conspiracy and fraud. Lay is convicted of all six counts against him and Skilling is found guilty on 19 counts of conspiracy, fraud, false statements and insider trading. Skilling is found not guilty on nine counts of insider trading. Judge Simeon T. Lake announces four guilty verdicts in the separate bench trial of Lay on separate counts of conspiracy and fraud.
July 5, 2006 - Ken Lay dies in Aspen, Colorado from a heart attack brought on by severe coronary artery disease.