Mark Zimmerman was 41 when he was last seen in Round Lake, Lake County, Illinois, on May 1, 2003. He is described as a Caucasian man with blond or strawberry blond hair and hazel eyes, about 5 feet 10 inches to 6 feet 2 inches tall and roughly 165 to 170 pounds. The Round Lake Police Department handled the investigation, which produced few clues and eventually went cold.

There is no public information about what he was wearing, whether he had belongings, his transportation, or his intended destination that day. National Missing and Unidentified Persons System still lists him as missing and the circumstances are recorded as unknown. Does anyone have information about Mark’s last movements or where he might have been on May 1, 2003?