2004: Federal investigation of corruption among Alaskan public officials begins.

2006-2008: Four ex-legislators, four businessmen or lobbyists, a former governor's chief of staff are convicted.

April 15, 2008: Prosecutors interview Bill Allen, owner of Anchorage oil-services firm Veco Corp., about U.S. Sen. Ted Stevens and Allen's connection to the expansion of the senator's Girdwood home.

July 29, 2008: Stevens indicted on seven felony counts of filing false financial disclosures from 2000 through 2006. A key allegation is that Veco secretly paid for much of the Stevens' home expansion.

Sept. 25, 2008: Trial begins in federal court in Washington, D.C.

Oct. 1, 2008: Allen testifies that a Stevens friend told him not to take seriously Stevens' request to be billed for the expansion work. "Ted's just covering his ass," Allen says he was told.

Oct. 27, 2008: Jury convicts Stevens on all seven counts. Stevens and his attorneys charge the verdict is unjust because of prosecutor misconduct before and during the trial. They soon file motions to dismiss the indictment or get a new trial.

Nov. 4, 2008: Stevens loses re-election bid for Senate seat he had held since 1968.

April 1, 2009: The Justice Department asks the judge to dismiss the indictment because the prosecutors failed to disclose key information to the defense. Notes from the April 15, 2008, interview contradict Allen's Oct. 1 testimony. A hearing on this motion is scheduled for Tuesday.