On February 9, 1989, Dock Thompson Sr., 49, and his son, Dock Thompson Jr. vanished from Tallahassee, Florida. They were last seen at their Texaco service station on Jackson Bluff Road; the last known person to see them was a contractor named Robert Lee Lindsey. Lindsey had an acknowledged financial dispute with Dock Sr. — Thompson had loaned him $25,000, and Lindsey’s attempts to repay by check had failed, with $5,000 in bounced checks that led to an arrest.

Lindsey returned later alone, saying Dock Jr.’s signature was needed; Dock Jr. then left with Lindsey. Lindsey later told staff he had dropped both men at Circle Drive and Highway 90 in Quincy, but neither man has been seen since. A private investigator suggested their bodies might have been disposed of in a mine shaft near Quincy or Gretna. Authorities regard Lindsey as a person of interest and suspect foul play.

The Thompsons were described by friends and family as close-knit and religious; Dock Sr. was known locally as a protective, often armed man, which some say makes his disappearance with Lindsey hard to reconcile. Does anyone have information about the Thompsons’ last day, Lindsey’s van, or the Quincy–Gretna mine shafts?