"I believe that was the last day of the grand jury and I believe they had to do something," says Peterson. "The state's attorney, I believe, was under a lot of pressure from both the media and the Savio family to do something."
Illinois authorities have been investigating Savio's death along with the disappearance of Peterson's fourth wife, Stacy, who has been missing for 18 months.
A closer examination of Peterson's divorce battle with Savio and what was at stake is being conducted by the Will County state's attorney's office, the Chicago Tribune has learned.
The Tribune says court documents it reviewed show Peterson stood to lose hundreds of thousands of dollars in a divorce from Savio.