UPDATE:

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

VIENNA TWP, MI - Police have identified the man killed after a rock was thrown off a highway overpass and smashed through the windshield of the vehicle he was riding in.

Kenneth Andrew White, 32, of Mt. Morris, was riding in a vehicle south on Interstate 75 when the windshield of the vehicle was struck by a large rock, the Genesee County Sheriff's Office said.

White was taken to Hurley Medical Center and pronounced dead, police previously said.

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.

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.