A historian’s effort to unseal grand jury records from the brazen 1946 lynching of two black couples on a Georgia riverbank prompted tough questions in a federal appeals court, but the judges also suggested there might be another way to win release of the records.

The young black sharecroppers were traveling a rural road in the summer of 1946 when a white mob stopped the car beside the Apalachee River, about 50 miles (80 kilometers) east of Atlanta. The mob dragged them out, led them to the river’s edge and shot them to death in a case that horrified the nation that year.

The FBI investigated for months and more than 100 people reportedly testified before a grand jury, but no one was ever indicted in the deaths of Roger and Dorothy Malcom and George and Mae Murray Dorsey at Moore’s Ford Bridge in Walton County.

Historian Anthony Pitch wrote about the unsolved killings — “The Last Lynching: How a Gruesome Mass Murder Rocked a Small Georgia Town” — and continued his research after the book’s 2016 publication. He learned transcripts of the grand jury proceedings, once thought to have been destroyed, were stored by the National Archives.

Pitch, died in June at age 80, before his case could be resolved, but his widow is continuing the fight, along with Laura Wexler, who wrote another book about the lynching and joined the case at the family’s request.