Mark Allen Collman was 21 and living in his parents’ basement in Yorkville, Illinois, when he went missing in the spring of 1979. He worked second shift at the local Model Box factory and did not show up for work; his boss called the family on April 3, 1979, to report he hadn’t appeared for his shift. There are conflicting accounts about the reporting timeline — one version has the employer’s call on April 3, another says his mother, then out of state, reported him missing after two weeks without contact.

Mark left behind his paycheck and savings, and his family has always maintained he would not voluntarily cut off contact. Foul play is considered a possibility. The Yorkville Police Department lists the investigation as open, and his parents later had him declared legally dead and placed a memorial stone. Few leads and little media attention have left the case unresolved.

If anyone knew Mark, where he worked, or saw him in Yorkville in March–April 1979, please share what is known.