The family of Concepcion Villa Herrera says he has not been seen since last Sunday.
Police say his vehicle was involved in a crash near the town of Utica that morning, and security video showed him walking in a wooded area near I-80.
Herrera is described as 5-foot-6 and 190 pounds with a gold front tooth.
He was last seen wearing a white Nike windbreaker.
The LaSalle County Sheriff's Office asked anyone with information to call them at 815-433-2161.