Preliminary autopsy results show that a missing 83-year-old woman found in a car submerged in a central Illinois lake drowned.

Reports indicate, McLean County Coroner Kathleen Davis released the findings Monday afternoon. Katherine Reardon of Morton was pulled from Evergreen Lake on Sunday morning in her submerged car. Davis says forensic toxicology tests have been ordered. The accident remains under investigation.

Reardon was a school bus monitor for Morton School District 709. Her daughter reported her missing Nov. 24 when she didn't show up for work. The coroner has said the death doesn't appear suspicious.