The Tennessee Bureau of Investigation has issued a Silver Alert for a missing Kingsport man. Authorities say that Robert Stallings was last seen on April 4th. The 77-year-old is 5-foot-8, weighs 210 pounds and has grey hair and brown eyes. If you see Stallings, call the Kingsport Police Department at (423) 229-9300 or TBI at 1-800-TBI-FIND.