Timeline in Drew Peterson investigation
March 1, 2004: The body of Drew Peterson's third wife, Kathleen Savio, 40, is discovered in a bathtub in her Bolingbrook home. Her death is initially ruled an accidental drowning.
Oct. 29, 2007: His fourth wife, Stacy, is reported missing, a day after she fails to show up at a family member's home.
Nov. 9, 2007: Illinois State Police declare Drew Peterson a suspect in Stacy's disappearance and announce they've launched an investigation into Savio's drowning death. A Will County judge signs an order to exhume Savio's body.
Nov. 12, 2007: Drew Peterson resigns from the Bolingbrook Police Department, where he had been an officer for nearly three decades.
Nov. 13, 2007: Savio's body is exhumed for a second autopsy.
Nov. 16, 2007: Forensic pathologist Dr. Michael Baden says Savio likely was murdered.
Nov. 21, 2007: A special Will County grand jury is convened to hear evidence in both cases involving Savio and Stacy Peterson.
Feb. 21, 2008: Kathleen Savio's death officially ruled a homicide.
May 21, 2008: Drew Peterson surrenders to police on a weapons charge unrelated to the disappearance of his fourth wife.
Nov. 20, 2008: Gun charges dropped against Peterson after Will County prosecutors refuse to hand over internal investigative documents.
May 7, 2009: Drew Peterson indicted on two counts of first-degree murder for Savio's drowning death; peacefully surrenders during a traffic stop.
May 18, 2009: Peterson pleads not guilty at arraignment; prosecution seeks judge substitution. Peterson remains held on a $20 million bond.