While reading the post about your best deer, I got to thinking about a deer my neighbor and a friend of his stumbled across while deer hunting in north St. Louis county, back in 1981. The deer was dead and I believe it was tangled in a fence, although cause of death was undetermined. It turned out to be a world record non-typical whitetail, and still holds the title, known as the Missouri Monarch. B&C World's Record - Non-typical Whitetail Deer
The Missouri Monarch was a road kill hit in 1981 and scores 333 7/8 inches and remains the largest non-hunter killed buck in history as recorded for a non-typical. Nov 15, 1981.
You're probably thinking of the buck that is named the Illinois Roadkill Buck. Considered bigger than the Missouri Monarch and the Hole in the Horn Buck, it only scores 176 5/8 because of it's weird rack. My neighbor has talked about being there when his buddy found the Missouri Monarch, it's death is listed as natural causes. They're all impressive animals.