It was discovered at approximately 3 a.m. Friday, near mile marker 38, in the southbound driving lane between exits 40 and 36.
The Union County Coroner has not yet released the name of the victim, but says police investigators are reconstructing the scene. The investigation has left southbound traffic on the interstate down to one lane.
Update from the Illinois State Police:
On April 12, 2013 at approximately 3:08 a.m. District 22 Units responded to 9-1-1 call of a pedestrian being struck on the roadway. The pedestrian was fatality injured and has yet to be identified. Anyone who would have been in the area and has information to provide is requested to contact the Illinois State Police, District 22 at (618) 845-3740, Ext. 292.