The (Peoria) Journal Star reports that a Peoria County coroner's jury spent more than 30 minutes deliberating Thursday before handing down a ruling in the Aug. 15 death of Marquail Johnson.
The boy's naked body was found in a refrigerator in a yard near his Peoria home, hours after he was reported missing. Peoria is 130 miles southwest of Chicago.
According to CBS Peoria affiliate WMBD, the original cause of death was suffocation and entrapment.
Detective Amanda Chalus says investigators still aren't sure how Johnson wound up in the appliance, which latched from the outside. They also don't know how long he was inside.
His clothes were also discovered inside the refrigerator. The investigation into his death continues.