UPDATE:

Billboards go up seeking tips after man killed by rock thrown from overpass

UPDATE:

Police ID man killed when rock thrown off overpass goes through windshield

VIENNA TWP, MI - A man died Wednesday when a large rock thrown from a highway overpass smashed through the windshield of the vehicle he was riding in on Interstate 75.

The Genesee County Sheriff's Office responded at 8:32 p.m. on Wednesday, Oct. 18, to southbound I-75 near the Dodge Road overpass to reports of an unknown accident, police said in a statement.

Preliminary investigation revealed a 32-year-old Mt. Morris man was riding in a vehicle south on I-75 when the windshield of the vehicle he was riding in was struck by a large rock, the statement said.

The rock went through the windshield and hit the man. He was taken to Hurley Medical Center and pronounced dead, police said.

The man's name has not been released by police because the man's family has not been notified.

There were four other vehicles that reported hitting other large rocks on the highway and were at the scene waiting for police to arrive, the statement said.

Police said they believe that the rocks may have been taken from another location and thrown off the overpass.

Anyone with information related to the incident - including any suspicious activity, dash cam footage or home surveillance footage in the area between 7 and 8:30 p.m. - is asked to call the Genesee County Sheriff's Office at 810-257-3422.

There is a $2,500 reward and tipsters also can call Crime Stoppers at 1-800-422-5244 or make a tip online at P3tips.com.