BALSAM LAKE, Wis. (AP) - A medical examiner says a 2-year-old western Wisconsin boy who died in a locked trunk likely died soon after his family reported him missing.

The body of 2-year-old Isaiah Theis was found in the trunk of a car last week on his family's property near Centuria. A preliminary autopsy shows the boy died from hyperthermia.

The Midwest Medical Examiner's Office says changes in Isaiah's body "were consistent with him dying soon after the time he was last known to be alive."

Public visitation for Isaiah will be held Tuesday at Trollhaugen ski resort in Dresser. A private funeral is scheduled Wednesday in St. Croix Falls.

The family's pastor says the boy likely climbed into the car trunk himself after grabbing the keys.