A 21-year-old Garrison man was found dead Sunday east of town.
The State Medical Examiner says Luke Hasenwinkel died from exposure.
The McLean County Sheriff's Department says they were called Sunday afternoon about a man that had been missing since Friday.
GPS coordinates from Hasenwinkel's cell phone led authorities east of Garrison where his body was found Sunday night.
Hasenwinkel is a 2010 graduate of Garrison High School.
No foul play is suspected.