David Block was a 22-year-old white male and recent Yale graduate who disappeared from Highland Park, Illinois, on December 30, 1982, while visiting his parents. He told family he planned to visit a friend in nearby Highwood but did not return. His new Volkswagen was later found abandoned on the Tri-State Tollway near Deerfield, about sixty miles north of Lake County, Indiana, where another related victim had been located.

Block’s body was not recovered until May 7, 1984, when a farmer found remains in a field south of Illinois Route 173. Investigators concluded he was one of the victims of Larry Eyler, the so-called Highway Killer, whose pattern involved abducting young men and abandoning their bodies near highways. Eyler was apprehended and later died in custody in 1994.

What information might help connect travel or sightings from the Highland Park–Highwood area on December 30, 1982, to Block’s abandoned vehicle on the Tri-State Tollway?