[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/CRIME/05/07/peterson.murder.arrest/art.peterson.file.gi.jpg caption="Drew Peterson was arrested Thursday on murder charges relating to his third wife, Kathleen Savio. "]
Drew Peterson, the former police sergeant who authorities call the prime suspect in the disappearance of his fourth wife, Stacy Peterson, has been indicted on murder charges related to his third wife, the Illinois state attorney's office said.
Illinois state police said Peterson was taken into custody Thursday.
Charles B. Pelkie, state attorney for Will County, Illinois, said a grand jury indicted Peterson in the murder of his third wife, Kathleen Savio, whose death had been ruled an accidental drowning.
He said the grand jury continues to meet and is studying the possibility of charges in Stacy Peterson's disappearance.
After Stacy Peterson went missing in October 2007, media frenzy and police scrutiny on Peterson revealed Savio had died mysteriously a few years earlier during a nasty divorce.
Savio died just before the division of the marital assets was finalized, making Drew Peterson the sole beneficiary.
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