Two Unrelated Missing Persons Cases Under Investigation L-R: Jeffery Silas Workman and Amy Christine Long Courtesy of Lincoln County Sheriff's Office Two Unrelated Missing Persons Cases Under Investigation April 9, 2021 Lincoln County Sheriff’s detectives are investigating two unrelated missing person cases. On Wednesday (April 7) deputies responded to the 3400 block of Lake Shore Road South reference a missing person. The reporting party told officers that 27-year-old Jeffery Silas Workman was last seen walking north on Highway 16 Business in Denver carrying a black duffel bag. Relatives describe him as having cognitive issues and does not have his medication. Workman is described as a white male, 5’11”, 150 pounds. He has light orange-tinted brown hair and facial beard and blue eyes. He was last seen wearing a black Nike hoodie, blue jeans and hiking boots.