UPDATE 9:30 a.m. Friday:
Ohio State Highway Patrol identified the victim as Gregory S. Wood, 39, of Carnegie, PA. The case remains under investigation.
The Ohio State Highway Patrol knows how a pedestrian was killed by a tractor trailer in the middle of the night.
But they can't imagine what he was doing there in the first place.
They say the middle aged white man from Pennsylvania suddenly appeared in front of a westbound tractor trailer on Interstate 70 between Bridgeport and St. Clairsville, Ohio at 2:40 a.m.
They say the driver saw a quick flash, felt a thump and thought he had hit a deer.
In fact, he called in a deer crash report to the Ohio State Highway Patrol.
"The driver reported that the object or deer that he saw actually came over the median wall, crossed over and walked into his lane of travel," said Lt. James Faunda, post commander.
Nearly an hour later, after countless other drivers had also hit this bundle in the highway, someone finally recognized it as a man's body.
But what was it doing there?
Walking to get help after his car broke down has been ruled out.
"We did not locate any disabled vehicles," says Lt. Faunda. "Therefore we do not know why he would have been on the interstate, especially at that time of night."
And in 15 degree weather, he had no coat.
"The victim was wearing sweat pants under a pair of jeans, and a T-shirt and then a sweater," said Lt. Faunda.
It's a mystery that everyone is talking about.
"It's sad," says Jennifer Long of Rayland. "It could have been a homeless person, nobody knows. There are a lot of homeless out there. And my heart goes out to them."
"I heard it on the news," says Will Ericson of Amsterdam, NY. "Someone walking at three o'clock in the morning on a busy highway like that? It's crazy."
They say on a Wednesday night, bars in the area were already closed. Blood alcohol tests won't yield results for another three weeks.
They did find identification on him. He had a Pennsylvania driver's license, with indications that he had lived up and down the East Coast.
Officers say they don't believe it was suicide. But they also say they may never know what he was doing there, coatless on a frigid night, in the middle of the highway.