JOLIET, IL - Prosecutors have told the judge at Drew Peterson's murder trial they expect to rest their case Friday.

They made the comment Thursday before the Will County judge adjourned for the day.

Prosecutors have called more than 30 witnesses over four weeks in a bid to prove Peterson killed his third wife, Kathleen Savio. He has pleaded not guilty.

If prosecutors do rest Friday, defense lawyers would have their chance to put on a case. They could also choose not to call any witnesses and argue to jurors that the state failed to meet their burden of proof.

Prosecutors faced major challenges heading into trial, including a lack of physical evidence.

Savio's 2004 death was reclassified from an accident to a homicide after Peterson's fourth wife, Stacy Peterson, disappeared in 2007.