FILE - In this May 7, 2009 file booking photo provided by the Will County Sheriff's office in Joliet, Ill., former Bolingbrook, Ill., police officer Drew Peterson is shown. Peterson is charged with first-degree murder in the 2004 drowning death of his former wife Kathleen Savio. Opening statements in his trial are scheduled to begin Tuesday, July 31, 2012. (AP Photo/Will County Sheriff's Office, File)
Drew Peterson (left) is on trial in the death of his third wife, Kathleen Savio.
Judge Edward Burmila arrives for day four of the Drew Peterson murder trial at the Will County Courthouse Friday, August 3, 2012, in Joliet. | Matthew Grotto~Sun-Times Media
Drew Peterson's attorneys return from lunch outside the Will County Courthouse Wednesday, August 1, 2012, in Joliet. | Matthew Grotto~Sun-Times Media
Will County State's Attorney James Glasgow, after his short press conference outside the Will County Courthouse. August 1, 2012. I Scott Stewart~Sun-Times
Stacy Peterson
Kathleen Savio
Two men who played crucial roles in investigating the scene of Kathleen Savio’s death — originally ruled an accident but now considered by authorities to be a homicide — are among the witnesses next expected to take the stand as Drew Peterson’s murder trial enters …