A federal report sent to congress in March noted that the 1955 case would be reopened in light of unspecified new information.
The Missouri city and DOJ officials are nearing a reform deal that will likely effect change and overhaul "unconstitutional" policing.
The Justice Department is set to open a federal civil rights investigation following the emergence of a now-viral video showing a school resource officer slamming and dragging a Black female student across the classroom.
Roof has already been indicted twice for the killings in state and federal court.
