Thomas Howe, 24, of Antioch was last seen Saturday, when witnesses say he left the scene of an accident on I-94 near Route 176, in Lake County, Illinois.
Two days later, on Monday, Howe's work cell phone was discovered in the Old School Forest Preserve in Libertyville.
Since then, the Illinois State Police, Lake County Sheriff's Office, and the Lake County Forest Preserve Police have all joined in the search.
If you have any information, call Antioch Police.