Jan '21 Update: They Have Been Identified Via DNA; Their Names Not Yet Released to Public -- Who Murdered this Couple? Was the Man "Jock or Jacques," a French Canadian from a Wealthy Family? The Sumter County (South Carolina) "John and Jane Does." Click

Ring engraved with "JPF"

"On August 9, 1976, the bodies of an unidentified white male and white female were discovered on a dirt road 1/2 mile from Interstate 95 and Highway 341 in Northeast Sumter County. The road is known as Locklair Road, a frontage road just off the interstate. Both victims were shot multiple times:" NAMUS. There are many clues to their identities, including the initials "JPF" on the man's ring ("J" for "Jacques" or "Jock?"), witnesses who met and saw them before their killings and their good health and professional dental work (likely done abroad for the man).  Yet they remain unidentified decades later. BTW, DNA testing determined they were not, contrary to speculation, siblings.

More detail and post-mortem photos of the couple can be found here.